To provide a curtain rail which is easily attached even under respective attaching conditions.

A cap 21 for hiding the ends of curtain rail bodies 11 and 12 includes a plate-like cap body 21a provided with rail attaching portions 21b and 21c to be fitted to the ends of the curtain rail bodies 11 and 12. The cap body 21a is made to project from the rail attaching portions 21b and 21c toward the rear side being a rail attaching surface side, thereby configuring a rear projection portion 21d. A hook holder attaching portion 32 is provided on the inner surface of the rear projection portion 21d, the inner surface being a surface on a side to which the rail attaching portions 21b and 21c are provided. The hook holder attaching portion 32 is composed of plural attaching portions 32a and 32b to which a hook holder 31 can be attached respectively so as to enable the adjustment of the attaching position of the hook holder 31 in the front and rear direction.