A cylinder apparatus includes a flow path formed at a valve member through which a fluid flows when a rod is moved, a valve configured to open and close the flow path, and a restriction member disposed at a side in a direction in which the flow path of the valve is opened. The restriction member is an annular plate-shaped member in which an attachment hole is formed. The restriction member has a plurality of spring sections extending in the radial direction and configured to bias the valve toward the valve member and a stroke restriction section extending from between the neighboring spring sections in the radial direction and configured to restrict a stroke of the valve, which are installed at an outer circumferential side thereof. The stroke restriction section extends to form the same plane as the inner circumferential side of the restriction member.