To make the aesthetic impression of bags changeable by exchanging a broach-like decoration in a simple operation.

This is a cover decoration of a small bag in which a broach-like decoration 3 which is on the surface of a cover part 2 covering an opening part of a bag main body 1 and gives the decorative effect to the bag is constituted by a base member 4 of which basic part is fixed in the cover part 2 and a decoration member 7 attached on a surface of the base member 4 detachably and which can be exchanged with a spare decoration member. A recessed part for locking 9 in which a male hook part 8 is at the center thereof is provided on either of a surface of the base member 4 and a rear surface of the decoration member 7, and a projecting part for locking 12, in which a female hook part 11 capable of engaging with and disengaging from the male hook part 8 freely is at the center thereof, is provided on the other surface.