| 摘要 |
The present invention provides a cylinder apparatus wherein although an opening of a cylinder body is closed by a covering member, processing and parts' costs are reduced, fluid leakage is prevented, and the apparatus can be reduced in size. A cylinder apparatus in which a piston 17 is caused to slidingly move in a bore 26 of a cylinder 21, the cylinder 21 comprising: a covering member 43 provided in a bottom portion 42 of the cylinder 21; and a cylinder body 46 having an opening that is closed by the covering member 43; the covering member 43 being friction stir welded to the cylinder body 46. |
