The present invention dicloses a bag for a mobile user.A bag for a mobile device user according to the present invention comprises a body having a front side, a back side, lateral sides, a top side, and a bottom side; a support board being placed on the front side; a first multi-position fixing unit being pivotally provided to the lateral sides or the front side; a second multi-position fixing unit being provided to both sides, a bottom side, or an outer side of the support board, and being pivotally combined with the support board; and a support arm in which one end of the support arm is pivotally combined with the first multi-position fixing unit, while the other end of the support arm is pivotally combined with the second multi-position fixing unit, wherein a position of the second multi-position fixing unit is adjusted by a rotational movement of the first multi-position fixing unit, and a tilting angle of the support board is adjusted by a rotational movement of the second multi-position fixing unit.