To provide a teeth-hardening toy with which motion of lips and operation by hands or fingers can be simultaneously learned so as to bridge from a detecting function of the mouth to training of hands as a detecting means.

This teeth-hardening toy includes a teeth-hardening member 40 formed of an elastic material so as to make the whole deformable and a base member 20 with a hollow body part with a pronunciation member housed inside. The teeth-hardening member 40 has convex and/or concave parts on the surface and can be attached on/detached from the base member 20.