PROBLEM TO BE SOLVED: To provide an intermaxillary rubber fitting tool which facilitates fitting of an intermaxillary rubber between a pair of hooks in an oral cavity and prevents tension of the intermaxillary rubber from decreasing already at the time of fitting the intermaxillary rubber between the pair of hooks.SOLUTION: An intermaxillary rubber fitting tool 100 comprises a grip part 110 gripped by a user, and an intermaxillary rubber locking part 120 for locking an intermaxillary rubber EB which is provided on a distal end side from the grip part 110. The intermaxillary rubber locking part 120 has distal end side locking portions 121 provided on the distal end side, and base part side locking portions 122 provided on a base part side from the distal end side locking portions 121. An interval (W1, W2) of at least one of the distal end side locking portions 121 and the base part side locking portions 122 is formed to be wider than hook widths of hooks of an upper jaw side bracket and hooks of a lower jaw side bracket, so that the intermaxillary rubber locking part 120 locks the intermaxillary rubber ED in a spread state.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】口腔内の一対のフック間に顎間ゴムを容易にかけるとともに顎間ゴムの張力が一対のフック間への顎間ゴムの装着時に既に低下してしまうことを回避する顎間ゴム装着用具を提供すること。【解決手段】ユーザに把持されるグリップ部110と、グリップ部110より先端側に配設されて顎間ゴムEBを係止する顎間ゴム係止部120とを備え、顎間ゴム係止部120が、先端側に配設された先端側係止部分121と、先端側係止部分121より基部側に配設された基部側係止部分122とを有し、先端側係止部分121および基部側係止部分122の少なくとも一方の間隔(W1、W2)が、上顎側ブラケットのフックおよび下顎側ブラケットのフックのフック幅より幅広に形成されて、顎間ゴム係止部120が、顎間ゴムEBを広げた状態で係止する顎間ゴム装着用具100。【選択図】図1