Medium conveying device, recording device, and method for determining skewing state of conveyance belt

A medium conveying device comprising:

• a first roller configured to be rotatable in a first rotational direction and in a second rotational direction opposite to the first rotational direction;
• a second roller disposed to be spaced apart from the first roller and configured to be rotatable in the first rotational direction and in the second rotational direction;
• a conveyance belt passed around the first roller and the second roller and configured to support and convey a medium on a supporting surface formed between the first roller and the second roller;
• and
• a controlling unit configured to control at least rotary drive of the first roller, wherein
• the controlling unit is configured to execute first control to determine whether a first skewing direction and a second skewing direction are the same,
• the first skewing direction indicating whether, when the first roller and the second roller are caused to rotate in the first rotational direction, the conveyance belt moves toward one side or the other side in a width direction intersecting a moving direction of the conveyance belt, and
• the second skewing direction indicating whether, when the first roller and the second roller are caused to rotate in the second rotational direction, the conveyance belt moves toward the one side or the other side in the width direction.