Abstract: A safety device used together with a push-push type latch device latching and releasing a movable body to a main body by a push operation against an urging force of an urging device, has a circulation cam groove having a reciprocation groove portion and a latch groove portion; a responding member having a pin to trace the circulation cam groove and a balancer disposed therein; and an urging member disposed on the responding member to urge the responding member in a pull-in direction. When the responding member receives a load, the responding member slides against an urging force of the urging member and the pin irreversibly moves from the reciprocation groove portion to the latch groove portion, so that even if the latching of the latch device is released due to the load, the movable body is retained in the fixed position.