CYLINDER HOUSING, ACTUATOR, AND CYLINDER HOUSING MANUFACTURING METHOD

A cylinder housing includes a cylindrical cylinder portion which extends in the direction of a center axis line Z and a bent portion which is bent with respect to the cylinder portion and extends inward in a radial direction from an end portion of the cylinder portion the cylinder portion includes a first cylinder portion and a second cylinder portion which is located on the side of the bent portion in the first cylinder portion and is connected to the bent portion a thickness B of the second cylinder portion is equal to or larger than a thickness A of the first cylinder portion and a thickness C of the bent portion is larger than the thickness A of the first cylinder portion