A crutch has a joint structure, and the crutch includes a stationary section supported on a floor at a lower end of the stationary section, and extending from a lower portion to an upper portion thereof; and a rotary section coupled to the stationary section so as to be rotatable relative to the stationary section with respect to a rotational axis provided at the upper portion of the stationary section. The rotary section is configured by coupling a hand grip part for supporting a wearer's hand in a state where the wearer wears the crutch and a forearm part supporting a forearm of the wearer.