A mouse pad includes a mouse pad body and a mobile device support area, and the mobile device support area is flatly extended from a side of the mouse pad body and can be turned clockwise, so that the mobile device support area sticks out in a direction towards the top of the mouse pad body to form a mobile device support stand. Users can use the mouse pad or the transformed mobile device support stand alone or use the mouse pad body for the operation of a mouse while using the transformed mobile device support stand to achieve the effect of watching a mobile device.