An energy treatment device includes a sheath including a hollow portion, a fixed handle provided at a proximal end of the sheath, a probe provided in the hollow portion, a movable handle including a jaw having a recessed portion along a rotation axis of the movable handle extending in a direction orthogonal to the central axis, a metal member provided at a position including the rotation axis, and a preventing member which prevents the metal member from falling out from its position. The sheath extends along a central axis of the energy treatment device and includes an attaching portion by which the movable handle is attached to a position offset from the central axis, the metal member is provided around the rotation axis such that the jaw is rotatable with respect to the sheath, and the prevention member is fixed to the recessed portion.