diff --git a/openapi_core/schema/schemas/exceptions.py b/openapi_core/schema/schemas/exceptions.py
index eaa63e9..9428190 100644
--- a/openapi_core/schema/schemas/exceptions.py
+++ b/openapi_core/schema/schemas/exceptions.py
@@ -48,10 +48,13 @@ class UnmarshallValueError(UnmarshallError):
 class InvalidSchemaValue(ValidateError):
     value = attr.ib()
     type = attr.ib()
+    schema_errors = attr.ib()
 
     def __str__(self):
-        return "Value {value} not valid for schema of type {type}".format(
-            value=self.value, type=self.type)
+        errors = list(self.schema_errors)
+        return (
+            "Value {value} not valid for schema of type {type}: {errors}"
+        ).format(value=self.value, type=self.type, errors=errors)
 
 
 class UnmarshallerError(UnmarshallError):
diff --git a/openapi_core/schema/schemas/models.py b/openapi_core/schema/schemas/models.py
index a1bc874..7bc4ad8 100644
--- a/openapi_core/schema/schemas/models.py
+++ b/openapi_core/schema/schemas/models.py
@@ -193,8 +193,8 @@ class Schema(object):
         try:
             return validator.validate(value)
         except ValidationError:
-            # TODO: pass validation errors
-            raise InvalidSchemaValue(value, self.type)
+            errors_iter = validator.iter_errors(value)
+            raise InvalidSchemaValue(value, self.type, errors_iter)
 
     def unmarshal(self, value, custom_formatters=None, strict=True):
         """Unmarshal parameter from the value."""
diff --git a/tests/integration/validation/test_petstore.py b/tests/integration/validation/test_petstore.py
index a7eba0e..38ab8ba 100644
--- a/tests/integration/validation/test_petstore.py
+++ b/tests/integration/validation/test_petstore.py
@@ -175,11 +175,13 @@ class TestPetstore(object):
 
         response_result = response_validator.validate(request, response)
 
+        errors = response_result.errors[0].original_exception.schema_errors
         assert response_result.errors == [
             InvalidMediaTypeValue(
                 original_exception=InvalidSchemaValue(
                     type=SchemaType.OBJECT,
                     value=data_json,
+                    schema_errors=errors,
                 ),
             ),
         ]