To provide a sheet carrying method capable of suppressing image distortion and uneven glossiness after fixing and decline in the carrying speed of a sheet material, and to provide a sheet carrying device and an image forming device.

When the moving speed of the sheet material becomes slower than the speed of a drive roller and the sheet material comes close to slip on the drive roller, a nip pressure adjusting means increases nip pressure. Due to increase in the nip pressure, contact pressure between the drive roller and the sheet material increases, and generation of the slip can be prevented. Thus, decline in the carrying speed of the sheet material can be suppressed, and decline in productivity can be suppressed.