A blender comprising: a container body for receiving food or objects; a main body configured to support the container body; a container lid mounted detachably to an upper surface of the container body and configured to open and close the upper surface of the container body, wherein the container body comprises: an outer container body constituting an exterior thereof, and an inner container body provided inside the outer container body, wherein space between the outer container body and the inner container body is blocked from the outside and/or is sealed; wherein the blender further comprising: a covering end extending laterally from an upper end of the inner container body; a guide end provided on a side of the container body and/or formed as a recess in the covering end, said blender being characterised in that the guide end is configured to introduce fluid from outside therethrough to perform a pneumatic inspection so as to inspect whether fluid leakage occurs due to a gap between the outer container body and the inner container body; wherein the guide end comprises: - a connecting part and - an injection part extending from the connecting part, wherein the connecting part comprises a connection hole configured to receive a connection tube from outside, which is inserted into the connection hole for fluid introduction, wherein when said guide end is formed as a recess in the covering end, said connecting part is extending from the covering end. a container body for receiving food or objects; a main body configured to support the container body; a container lid mounted detachably to an upper surface of the container body and configured to open and close the upper surface of the container body, wherein the container body comprises: an outer container body constituting an exterior thereof, and an inner container body provided inside the outer container body, wherein space between the outer container body and the inner container body is blocked from the outside and/or is sealed; wherein the blender further comprising: a covering end extending laterally from an upper end of the inner container body; a guide end provided on a side of the container body and/or formed as a recess in the covering end, said blender being characterised in that the guide end is configured to introduce fluid from outside therethrough to perform a pneumatic inspection so as to inspect whether fluid leakage occurs due to a gap between the outer container body and the inner container body; wherein the guide end comprises: - a connecting part and - an injection part extending from the connecting part, wherein the connecting part comprises a connection hole configured to receive a connection tube from outside, which is inserted into the connection hole for fluid introduction, wherein when said guide end is formed as a recess in the covering end, said connecting part is extending from the covering end. an outer container body constituting an exterior thereof, and an inner container body provided inside the outer container body, wherein space between the outer container body and the inner container body is blocked from the outside and/or is sealed; wherein the blender further comprising: a covering end extending laterally from an upper end of the inner container body; a guide end provided on a side of the container body and/or formed as a recess in the covering end, said blender being characterised in that the guide end is configured to introduce fluid from outside therethrough to perform a pneumatic inspection so as to inspect whether fluid leakage occurs due to a gap between the outer container body and the inner container body; wherein the guide end comprises: - a connecting part and - an injection part extending from the connecting part, wherein the connecting part comprises a connection hole configured to receive a connection tube from outside, which is inserted into the connection hole for fluid introduction, wherein when said guide end is formed as a recess in the covering end, said connecting part is extending from the covering end. a covering end extending laterally from an upper end of the inner container body; a guide end provided on a side of the container body and/or formed as a recess in the covering end, said blender being characterised in that the guide end is configured to introduce fluid from outside therethrough to perform a pneumatic inspection so as to inspect whether fluid leakage occurs due to a gap between the outer container body and the inner container body; wherein the guide end comprises: - a connecting part and - an injection part extending from the connecting part, - a connecting part and - an injection part extending from the connecting part, wherein the connecting part comprises a connection hole configured to receive a connection tube from outside, which is inserted into the connection hole for fluid introduction, wherein when said guide end is formed as a recess in the covering end, said connecting part is extending from the covering end.