To provide a supporter for tenosynovitis capable of promoting improvement of a symptom of tenosynovitis by suppressing spread of a joint of a wrist.SOLUTION: A supporter for tenosynovitis includes a palm expansion part for expanding a palm so as to be warped. The palm expansion part has a first annular part constituted of a twisted annular elastic member, for inserting a first finger thereinto, a second annular part for inserting a fifth finger thereinto, and a crossing part provided between the first and second annular parts, where two linear parts of the elastic member cross with each other. Such a palm expansion part is mounted on a hand so that the crossing part is arranged on the hand back side.SELECTED DRAWING: Figure 1
