<p>A morphologically deforming toy allowing a morphological deformation between a doll robot toy and a quadruped walking robot toy to form the rear leg parts of the quadruped walking robot toy in a more natural shape. A pair of leg parts (11) of the doll robot toy (1) comprises knee position connection mechanisms (114) connecting thigh parts (111) to leg parts (112) and ankle position connection mechanisms (115) connecting the leg parts (112) to foot parts (113). Each of the knee position connection mechanisms (114) further comprises a connection link (118) connected to the thigh part (111) and the leg part (112) through revolute pairs (116) and (117). Also, each of the ankle position connection mechanisms (115) is formed to connect the leg part (112) to the foot part (113) through revolute pairs (119). The leg part (112) is so formed that its length can be adjusted longer for the doll robot toy and shorter for the quadruped walking robot toy.</p>
