A grasping treatment instrument includes a grasping piece openable and closable relative to a treatment section, and a pad member is attached along an installation surface of a holder member in the grasping piece while elastically deformed from a natural state. The pad member extends straight in the natural state. A holder inclined surface is provided on the installation surface, and inclines in a state that the holder inclined surface extends toward a treatment section side as extending toward a distal side. A pad inclined surface is formed on an abutment surface in the pad member due to an inclination of the holder inclined surface, and inclines in a state that the pad inclined surface extends toward the treatment section side as extending toward the distal side.
