A metal bellows type accumulator comprising: an outer shell which is provided in its one end with a pressure introducing passage in an opening manner; a metal bellows which is capable of expanding and contracting in an axial direction, is formed by peak portions directed to an outer side in a radial direction and trough portions directed to an inner side alternately in an axial direction, has its one end in the axial direction fixed to the outer shell and separates an inner chamber of the outer shell into a pressure introducing chamber which is communicated with the pressure introducing passage and a gas chamber which is configured to be charged with cushion gas; and a support member which is arranged in an inner periphery of the metal bellows, wherein the support member is fixed to the outer shell and is constructed by a cushioning member; wherein a clearance (δ2) is provided in a radial direction between the trough portions of the metal bellows and an outer peripheral surface of the support member, the clearance (δ2) being smaller than a clearance (δ1) in a radial direction between the peak portions of the metal bellows and an inner peripheral surface of the outer shell, characterized in that the outer peripheral surface of the support member has a cushioning property; and in that any vibration in the radial direction generated in the metal bellows in the course of the expansion and contraction is restricted by the contact of the trough portions of the metal bellows with the outer peripheral surface of the support member, so that the peak portions of the metal bellows are prevented from coming into collision with the inner peripheral surface of the outer shell, wherein the impact of the metal bellows is cushioned by the cushioning property of the outer peripheral surface of the support member. an outer shell which is provided in its one end with a pressure introducing passage in an opening manner; a metal bellows which is capable of expanding and contracting in an axial direction, is formed by peak portions directed to an outer side in a radial direction and trough portions directed to an inner side alternately in an axial direction, has its one end in the axial direction fixed to the outer shell and separates an inner chamber of the outer shell into a pressure introducing chamber which is communicated with the pressure introducing passage and a gas chamber which is configured to be charged with cushion gas; and a support member which is arranged in an inner periphery of the metal bellows, wherein the support member is fixed to the outer shell and is constructed by a cushioning member; wherein a clearance (δ2) is provided in a radial direction between the trough portions of the metal bellows and an outer peripheral surface of the support member, the clearance (δ2) being smaller than a clearance (δ1) in a radial direction between the peak portions of the metal bellows and an inner peripheral surface of the outer shell, characterized in that the outer peripheral surface of the support member has a cushioning property; and in that any vibration in the radial direction generated in the metal bellows in the course of the expansion and contraction is restricted by the contact of the trough portions of the metal bellows with the outer peripheral surface of the support member, so that the peak portions of the metal bellows are prevented from coming into collision with the inner peripheral surface of the outer shell, wherein the impact of the metal bellows is cushioned by the cushioning property of the outer peripheral surface of the support member.