A jaw of a grasping treatment device includes an abutting portion abutable on a probe treatment portion when the jaw is closed relative to the probe treatment portion, and a separated portion disposed with a clearance between the separated portion and the probe treatment portion when the abutting portion is in abutment with the probe treatment portion. The jaw includes a distal-side wall portion provided to a distal direction side of the separated portion and protruding toward the probe treatment portion as compared with the separated portion, and a proximal-side wall portion provided to a proximal direction side of the separated portion and protruding toward the probe treatment portion as compared with the separated portion.
