diff --git a/src/pl/plpython/expected/plpython_types.out b/src/pl/plpython/expected/plpython_types.out
index 91106e04550b274ef9e4d7903b54b2b9f0325191..785ffca9cd8f78ffda13a67f53a80ec2f47b985a 100644
--- a/src/pl/plpython/expected/plpython_types.out
+++ b/src/pl/plpython/expected/plpython_types.out
@@ -664,6 +664,34 @@ SELECT * FROM test_type_conversion_array_error();
 ERROR:  return value of function with array return type is not a Python sequence
 CONTEXT:  while creating return value
 PL/Python function "test_type_conversion_array_error"
+CREATE DOMAIN ordered_pair_domain AS integer[] CHECK (array_length(VALUE,1)=2 AND VALUE[1] < VALUE[2]);
+CREATE FUNCTION test_type_conversion_array_domain(x ordered_pair_domain) RETURNS ordered_pair_domain AS $$
+plpy.info(x, type(x))
+return x
+$$ LANGUAGE plpythonu;
+SELECT * FROM test_type_conversion_array_domain(ARRAY[0, 100]::ordered_pair_domain);
+INFO:  ([0, 100], <type 'list'>)
+CONTEXT:  PL/Python function "test_type_conversion_array_domain"
+ test_type_conversion_array_domain 
+-----------------------------------
+ {0,100}
+(1 row)
+
+SELECT * FROM test_type_conversion_array_domain(NULL::ordered_pair_domain);
+INFO:  (None, <type 'NoneType'>)
+CONTEXT:  PL/Python function "test_type_conversion_array_domain"
+ test_type_conversion_array_domain 
+-----------------------------------
+ 
+(1 row)
+
+CREATE FUNCTION test_type_conversion_array_domain_check_violation() RETURNS ordered_pair_domain AS $$
+return [2,1]
+$$ LANGUAGE plpythonu;
+SELECT * FROM test_type_conversion_array_domain_check_violation();
+ERROR:  value for domain ordered_pair_domain violates check constraint "ordered_pair_domain_check"
+CONTEXT:  while creating return value
+PL/Python function "test_type_conversion_array_domain_check_violation"
 ---
 --- Composite types
 ---
diff --git a/src/pl/plpython/expected/plpython_types_3.out b/src/pl/plpython/expected/plpython_types_3.out
index 523c2ecda23711c08bbec8cc573ef79233d4dc03..25331f268a1e456a484ccba328198eed2cd87313 100644
--- a/src/pl/plpython/expected/plpython_types_3.out
+++ b/src/pl/plpython/expected/plpython_types_3.out
@@ -664,6 +664,34 @@ SELECT * FROM test_type_conversion_array_error();
 ERROR:  return value of function with array return type is not a Python sequence
 CONTEXT:  while creating return value
 PL/Python function "test_type_conversion_array_error"
+CREATE DOMAIN ordered_pair_domain AS integer[] CHECK (array_length(VALUE,1)=2 AND VALUE[1] < VALUE[2]);
+CREATE FUNCTION test_type_conversion_array_domain(x ordered_pair_domain) RETURNS ordered_pair_domain AS $$
+plpy.info(x, type(x))
+return x
+$$ LANGUAGE plpython3u;
+SELECT * FROM test_type_conversion_array_domain(ARRAY[0, 100]::ordered_pair_domain);
+INFO:  ([0, 100], <class 'list'>)
+CONTEXT:  PL/Python function "test_type_conversion_array_domain"
+ test_type_conversion_array_domain 
+-----------------------------------
+ {0,100}
+(1 row)
+
+SELECT * FROM test_type_conversion_array_domain(NULL::ordered_pair_domain);
+INFO:  (None, <class 'NoneType'>)
+CONTEXT:  PL/Python function "test_type_conversion_array_domain"
+ test_type_conversion_array_domain 
+-----------------------------------
+ 
+(1 row)
+
+CREATE FUNCTION test_type_conversion_array_domain_check_violation() RETURNS ordered_pair_domain AS $$
+return [2,1]
+$$ LANGUAGE plpython3u;
+SELECT * FROM test_type_conversion_array_domain_check_violation();
+ERROR:  value for domain ordered_pair_domain violates check constraint "ordered_pair_domain_check"
+CONTEXT:  while creating return value
+PL/Python function "test_type_conversion_array_domain_check_violation"
 ---
 --- Composite types
 ---
diff --git a/src/pl/plpython/plpy_typeio.c b/src/pl/plpython/plpy_typeio.c
index caccbf9b88ff6e373e5f1a2858e2a56ae4f60275..0a2307abdb98306a703b9b343f52e08126c87de7 100644
--- a/src/pl/plpython/plpy_typeio.c
+++ b/src/pl/plpython/plpy_typeio.c
@@ -373,7 +373,7 @@ PLy_output_datum_func2(PLyObToDatum *arg, HeapTuple typeTup)
 	arg->typioparam = getTypeIOParam(typeTup);
 	arg->typbyval = typeStruct->typbyval;
 
-	element_type = get_element_type(arg->typoid);
+	element_type = get_base_element_type(arg->typoid);
 
 	/*
 	 * Select a conversion function to convert Python objects to PostgreSQL
@@ -427,7 +427,8 @@ static void
 PLy_input_datum_func2(PLyDatumToOb *arg, Oid typeOid, HeapTuple typeTup)
 {
 	Form_pg_type typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
-	Oid			element_type = get_element_type(typeOid);
+	/* It's safe to handle domains of array types as its base array type. */
+	Oid			element_type = get_base_element_type(typeOid);
 
 	/* Get the type's conversion information */
 	perm_fmgr_info(typeStruct->typoutput, &arg->typfunc);
@@ -808,6 +809,7 @@ static Datum
 PLySequence_ToArray(PLyObToDatum *arg, int32 typmod, PyObject *plrv)
 {
 	ArrayType  *array;
+	Datum       rv;
 	int			i;
 	Datum	   *elems;
 	bool	   *nulls;
@@ -844,8 +846,15 @@ PLySequence_ToArray(PLyObToDatum *arg, int32 typmod, PyObject *plrv)
 
 	lbs = 1;
 	array = construct_md_array(elems, nulls, 1, &len, &lbs,
-							   get_element_type(arg->typoid), arg->elm->typlen, arg->elm->typbyval, arg->elm->typalign);
-	return PointerGetDatum(array);
+							   get_base_element_type(arg->typoid), arg->elm->typlen, arg->elm->typbyval, arg->elm->typalign);
+	/*
+	 * If the result type is a domain of array, the resulting array must be
+	 * checked.
+	 */
+	rv = PointerGetDatum(array);
+	if (get_typtype(arg->typoid) == TYPTYPE_DOMAIN)
+		domain_check(rv, false, arg->typoid, &arg->typfunc.fn_extra, arg->typfunc.fn_mcxt);
+	return rv;
 }
 
 
diff --git a/src/pl/plpython/sql/plpython_types.sql b/src/pl/plpython/sql/plpython_types.sql
index e63d07e1f9aeec09e935dd7ee9528cd5ced7736a..ee6b0e9e981d4f8615f99a34198ed6d81bb6b9ff 100644
--- a/src/pl/plpython/sql/plpython_types.sql
+++ b/src/pl/plpython/sql/plpython_types.sql
@@ -294,6 +294,26 @@ $$ LANGUAGE plpythonu;
 SELECT * FROM test_type_conversion_array_error();
 
 
+--
+-- Domains over arrays
+--
+
+CREATE DOMAIN ordered_pair_domain AS integer[] CHECK (array_length(VALUE,1)=2 AND VALUE[1] < VALUE[2]);
+
+CREATE FUNCTION test_type_conversion_array_domain(x ordered_pair_domain) RETURNS ordered_pair_domain AS $$
+plpy.info(x, type(x))
+return x
+$$ LANGUAGE plpythonu;
+
+SELECT * FROM test_type_conversion_array_domain(ARRAY[0, 100]::ordered_pair_domain);
+SELECT * FROM test_type_conversion_array_domain(NULL::ordered_pair_domain);
+
+CREATE FUNCTION test_type_conversion_array_domain_check_violation() RETURNS ordered_pair_domain AS $$
+return [2,1]
+$$ LANGUAGE plpythonu;
+SELECT * FROM test_type_conversion_array_domain_check_violation();
+
+
 ---
 --- Composite types
 ---