A method for manufacturing a stretchable sheet, comprising: a supplying step in which a stretchable elastic film is interposed in a stretched state between a first sheet layer having no elasticity and a second sheet layer having no elasticity; and a bonding step in which, in a state where the elastic film is interposed in a stretched state between the first sheet layer and the second sheet layer in the supplying step, the first sheet layer and the second sheet layer are bonded directly or via an elastic film at a plurality of bonded portions by applying heat melt energy to a region of the plurality of bonded portions spaced apart from each other by a heat melting apparatus from the outside of the first sheet layer and the second sheet layer to melt the elastic film, wherein the heat melting apparatus has an anvil roll and an ultrasonic horn, the anvil roll has a plurality of protrusions spaced apart from each other in a roll length direction and an outer circumference direction on an outer surface of the anvil roll, a counter roll is disposed apart from the anvil roll, the elastic film is not nipped between the anvil roll and the counter roll, a nip roll that nips the elastic film is disposed corresponding to the counter roll, the elastic film passes through a nip position between the counter roll and the nip roll to pass along the counter roll and then along the anvil roll, the elastic film is stretched by making a circumferential speed of the anvil roll faster than a circumferential speed of the counter roll, and bonding is performed by the ultrasonic horn and a group of the protrusions of the anvil roll, wherein the elastic film passes along the counter roll with a holding angle α of less than 90° with respect to the counter roll, and the elastic film and the second sheet layer pass along the anvil roll with a holding angle β of less than 90°, and a distance from a position where the elastic film is separated from the counter roll to a position where the elastic film starts to be held by the anvil roll is 50 mm or less. a supplying step in which a stretchable elastic film is interposed in a stretched state between a first sheet layer having no elasticity and a second sheet layer having no elasticity; and a bonding step in which, in a state where the elastic film is interposed in a stretched state between the first sheet layer and the second sheet layer in the supplying step, the first sheet layer and the second sheet layer are bonded directly or via an elastic film at a plurality of bonded portions by applying heat melt energy to a region of the plurality of bonded portions spaced apart from each other by a heat melting apparatus from the outside of the first sheet layer and the second sheet layer to melt the elastic film, wherein the heat melting apparatus has an anvil roll and an ultrasonic horn, the anvil roll has a plurality of protrusions spaced apart from each other in a roll length direction and an outer circumference direction on an outer surface of the anvil roll, a counter roll is disposed apart from the anvil roll, the elastic film is not nipped between the anvil roll and the counter roll, a nip roll that nips the elastic film is disposed corresponding to the counter roll, the elastic film passes through a nip position between the counter roll and the nip roll to pass along the counter roll and then along the anvil roll, the elastic film is stretched by making a circumferential speed of the anvil roll faster than a circumferential speed of the counter roll, and bonding is performed by the ultrasonic horn and a group of the protrusions of the anvil roll, wherein the elastic film passes along the counter roll with a holding angle α of less than 90° with respect to the counter roll, and the elastic film and the second sheet layer pass along the anvil roll with a holding angle β of less than 90°, and a distance from a position where the elastic film is separated from the counter roll to a position where the elastic film starts to be held by the anvil roll is 50 mm or less.