An application kit comprising: a cartridge (2, 2A) including a sheet member; and an applicator being connectable to the cartridge (2, 2A), wherein the cartridge (2, 2A) includes: a bending portion (14, 14A) configured to bend the sheet member for applying the sheet member to skin; and a cartridge-side connector configured to be detachably connected to the applicator, the applicator includes: an applicator body; an applicator-side connector provided to a bottom portion of the applicator body; a cap provided above the applicator body and being movable along a height direction of the applicator body; and an elastic member extending along the height direction between the applicator body and the cap and configured to apply, to the cap, an elastic force that acts in a direction away from the bottom portion, and the applicator body further includes: a stopper configured to press the sheet member on the cartridge (2, 2A) in a non-pressed state in which the cap is apart from the bottom portion due to the elastic force, and be moved away from the sheet member in the pressed state; and a camshaft configured to move the stopper toward the sheet member when the cap is moved in the direction away from the bottom portion by the elastic force, and move the stopper in a direction away from the sheet member when the cap is moved toward the bottom portion against the elastic force, and in a pressed state in which the cartridge-side connector has been connected to the applicator-side connector and the cap has been moved toward the bottom portion against the elastic force, the bending portion (14, 14A) bends the sheet member that has advanced to the bending portion (14, 14A). a cartridge (2, 2A) including a sheet member; and an applicator being connectable to the cartridge (2, 2A), wherein the cartridge (2, 2A) includes: a bending portion (14, 14A) configured to bend the sheet member for applying the sheet member to skin; and a cartridge-side connector configured to be detachably connected to the applicator, a bending portion (14, 14A) configured to bend the sheet member for applying the sheet member to skin; and a cartridge-side connector configured to be detachably connected to the applicator, the applicator includes: an applicator body; an applicator-side connector provided to a bottom portion of the applicator body; a cap provided above the applicator body and being movable along a height direction of the applicator body; and an elastic member extending along the height direction between the applicator body and the cap and configured to apply, to the cap, an elastic force that acts in a direction away from the bottom portion, and an applicator body; an applicator-side connector provided to a bottom portion of the applicator body; a cap provided above the applicator body and being movable along a height direction of the applicator body; and an elastic member extending along the height direction between the applicator body and the cap and configured to apply, to the cap, an elastic force that acts in a direction away from the bottom portion, and the applicator body further includes: a stopper configured to press the sheet member on the cartridge (2, 2A) in a non-pressed state in which the cap is apart from the bottom portion due to the elastic force, and be moved away from the sheet member in the pressed state; and a camshaft configured to move the stopper toward the sheet member when the cap is moved in the direction away from the bottom portion by the elastic force, and move the stopper in a direction away from the sheet member when the cap is moved toward the bottom portion against the elastic force, and a stopper configured to press the sheet member on the cartridge (2, 2A) in a non-pressed state in which the cap is apart from the bottom portion due to the elastic force, and be moved away from the sheet member in the pressed state; and a camshaft configured to move the stopper toward the sheet member when the cap is moved in the direction away from the bottom portion by the elastic force, and move the stopper in a direction away from the sheet member when the cap is moved toward the bottom portion against the elastic force, and in a pressed state in which the cartridge-side connector has been connected to the applicator-side connector and the cap has been moved toward the bottom portion against the elastic force, the bending portion (14, 14A) bends the sheet member that has advanced to the bending portion (14, 14A).