To provide a blanket to be used in an automobile or the like which is usable both as a covering and a sunshade.

For using this blanket 1 as a covering, the blanket 1 is put on a front part of a seat where an infant is seated. Next, a strap 4 is put on a back part of the seat, both ends of it are brought forward, clips 2 at both ends of it are set on the blanket 1, and the length of the strap 4 is adjusted by a buckle 6. For using this as a sunshade to a window, the clips 2 at both ends of the strap 4 are attached to both ends of the blanket 1 by adjusting the length of the strap 4, and two suckers 3 connected to the two clips 2 are pressed to the window.