A grasping treatment device comprising: a probe extended along a longitudinal axis, the probe including a probe treatment portion provided to a distal portion thereof; a jaw which is configured to open or close relative to the probe treatment portion, and which is configured to grasp a grasping target (M;V) between the probe treatment portion and the jaw; an abutting portion which is provided to the jaw, and which is configured to be abutable on the probe treatment portion when the jaw is closed relative to the probe treatment portion; and a separated portion (123A,123B) which is provided to the jaw, and which is configured to be disposed with a clearance between the separated portion (123A,123B) and the probe treatment portion when the abutting portion is in abutment with the probe treatment portion, characterized by further comprising: a distal-side wall portion (125A,125B;125) which is provided to a distal direction side of the separated portion (123A,123B) in the jaw, and which protrudes toward the probe treatment portion as compared with the separated portion (123A,123B), the distal-side wall portion (125A,125B;125) being configured to regulate a movement of the grasping target toward the distal direction away from the separated portion (123A,123B); and a proximal-side wall portion (128A,128B;128) which is provided to a proximal direction side of the separated portion (123A,123B) in the jaw, and which protrudes toward the probe treatment portion as compared with the separated portion (123A,123B), the proximal-side wall portion (128A,128B;128) being configured to regulate a movement of the grasping target toward the proximal direction away from the separated portion (123A,123B). a probe extended along a longitudinal axis, the probe including a probe treatment portion provided to a distal portion thereof; a jaw which is configured to open or close relative to the probe treatment portion, and which is configured to grasp a grasping target (M;V) between the probe treatment portion and the jaw; an abutting portion which is provided to the jaw, and which is configured to be abutable on the probe treatment portion when the jaw is closed relative to the probe treatment portion; and a separated portion (123A,123B) which is provided to the jaw, and which is configured to be disposed with a clearance between the separated portion (123A,123B) and the probe treatment portion when the abutting portion is in abutment with the probe treatment portion, a distal-side wall portion (125A,125B;125) which is provided to a distal direction side of the separated portion (123A,123B) in the jaw, and which protrudes toward the probe treatment portion as compared with the separated portion (123A,123B), the distal-side wall portion (125A,125B;125) being configured to regulate a movement of the grasping target toward the distal direction away from the separated portion (123A,123B); and a proximal-side wall portion (128A,128B;128) which is provided to a proximal direction side of the separated portion (123A,123B) in the jaw, and which protrudes toward the probe treatment portion as compared with the separated portion (123A,123B), the proximal-side wall portion (128A,128B;128) being configured to regulate a movement of the grasping target toward the proximal direction away from the separated portion (123A,123B).