An all in one computer includes an enclosure and a support module attached to the enclosure. The support module includes a leg stand rotatably attached to a rear panel of the enclosure about an axis perpendicular to the rear panel. The leg stand includes a shorter base and a longer base. An operation opening is defined in the leg stand and located adjacent to the longer base. The leg stand is rotatable between a first position where the longer base faces downward to support the enclosure, and a second position where the longer base faces upwards for facilitating using the operation opening to carry the all in one computer.