Abstract: The present invention provides a 3D printer using a linear laser source, the 3D printer including: a vat disposed at a lower portion inside a frame and configured to contain liquid photocurable resin therein; a bed configured to be vertically movable in the vat and to support an object; a bed-carrying unit configured to move the bed vertically; a light emission unit configured to cure the liquid photocurable resin in the vat to form the object by radiating a laser beam to the liquid photocurable resin in the vat; a light emission unit-carrying unit configured to move the light emission unit in the longitudinal direction of the vat; and a control unit configured to control operation of the light emission unit, the light emission unit-carrying unit, and the bed-carrying unit, wherein the light emission unit linearly emits a laser beam in the width direction of the vat.