PROBLEM TO BE SOLVED: To provide a method for producing a laminate with which an additive and the like hardly fall during production and conveyance of the laminate including the additive as a middle layer, and a substrate sheet covering the middle layer hardly rolls up during production and conveyance, and which thus enables productivity to be improved.SOLUTION: The method for producing a laminate comprises steps of: adding an additive 4 comprising a viscous product or powder on a first substrate sheet 1A which is being conveyed superimposing a second substrate sheet 1B so as to put the additive 4 between the sheets sealing the superimposed substrate sheets 1A and 1B by fusion along a direction of conveyance and cutting the substrate sheets 1A and 1B. Between the addition step and the superimposing step, there is added a step of forming a stripe-like concavity 5 on an outside surface of the additive 4 on the first substrate sheet 1A. In the sealing step, sealing is performed at a position corresponding to the concavity 5. In the cutting step, cutting is performed at a position corresponding to the seal portion 6.
