A sheet laser welding device comprises: a support member that supports the lower surface of a sheet by a linear region; a heat generating member that covers the upper surface of the sheet; a pressing portion that presses the heat generating member against the sheet; a laser beam irradiation unit that irradiates the heat generating member with a laser beam to generate heat; and a control unit, wherein in a state in which the lower surface of the sheet is supported by the linear region of the support member, the upper surface of the sheet is covered with the heat generating member, and the heat generating member is pressed against the upper surface of the sheet by the pressing portion to be brought into close contact with the sheet, the control unit performs control to cause the laser beam irradiation unit to irradiate the heat generating member and generate heat, and to heat and weld the sheet by transferring the heat generated by the heat generating member toward the linear region of the support member.
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