To provide a shift preventing implement for a blanket solving a problem wherein the blanket is inevitably drawn to one side or falls in the case of a bed if a user turns over in the bed during sleep, which causes the feet to get cold or causes troublesomeness of readjusting the blanket in the middle of the night.

Both right and left sides of the blanket are clamped by two large clothespins (hereinafter referred to as spring clips), and the spring clips are connected by an elastic cord. When the blanket is clamped, a padding is put inside.