To provide a human body shape model of various kinds such as a mannequin composed of a plurality of components made of materials which are optionally expandable and contractable in response to charge and discharge of fluid.

A barrel member 1 are removably attached in the upper and lower aprts thereof with a heat part 2, upper arms 3, lower arms 4, hand parts 5, sigh parts 6 and leg parts 7 and foot parts 8, which are expandable, through the intermediary of coupling means A, and the upper part and breast part of the barrel member 1 are provided therein with shoulder pads 9 and breast pads 10, respectively. Further, these pads are formed therein with ports B through which fluid is charged and discharged, so as to expand the pads as necessary.