An endo-therapy product system includes an introduction device (10) led into a body cavity, a treatment device (60) and a cartridge (70). The cartridge includes a treatment device accommodating portion (73) in which the treatment device is accommodated. The treatment device accommodating portion includes a coupling member accommodating portion (79) which accommodates a coupling member (62) of the treatment device and a treatment device main body accommodating portion (76) which accommodates a treatment device main body (61, 63). The coupling member accommodating portion prevents a connecting portion (31) of the introduction device from being engaged with an engagement portion (62b) at a proximal end of the coupling member. The treatment device main body accommodating portion is provided on a distal end side of the coupling member accommodating portion, has the treatment device main body arranged therein, and includes an engagement allowing portion (78a) which allows engagement when engaging the connecting portion of the introduction device with the engagement portion of the coupling member.
