A cap attachment with excising function attached to the tip of an insert part of an endoscope inserted into the body the cap attachment comprising a cylindrically shaped body part 2 and a plate-shaped excising part projecting from the tip of the body part 2 in the axial direction and the excising part 4 comprising a tip electrode 6 extending the width direction at the tip thereof. According to this cap attachment with excising function 1, excising operation ON organic tissues can be performed easily and accurately.
