A composite sheet manufacturing device (10, 10a) comprising: a first roller having a first outer circumferential face and a plurality of recessed areas retracted from the first outer circumferential face, a second roller (22, 23) disposed so as to be adjacent to the first roller, rotated in synchronization with the first roller and having a second outer circumferential face (22s, 23s) opposed to the first outer circumferential face of the first roller and a plurality of first projections (22a, 23a) that protrude from the second outer circumferential face so as to be inserted into and extracted from the recessed areas of the first roller in a state in which a clearance is provided between each first projection thereof and each recessed area of the first roller, and a third roller disposed so as to be adjacent to the first roller, rotated in synchronization with the first roller and having a third outer circumferential face opposed to the first outer circumferential face of the first roller, wherein a first sheet is fed in between the first roller and the second roller (22, 23) conveyed while being supported by the first outer circumferential face of the first roller and passed through a space between the first roller and the second roller (22, 23), when the first sheet is passed through the space between the first roller and the second roller, the first projections (22a, 23a) of the second roller (22, 23) push the first sheet into the recessed areas (20 a) of the first roller, and thereby the first sheet is shaped, a second sheet is superimposed onto the shaped first sheet and conveyed together with the first sheet and then passed through a space between the first roller and the third roller, when the first sheet and the second sheet are passed through the space between the first roller and the third roller, the first roller and the third roller hold the first sheet and the second sheet therebetween, and thereby the first sheet and the second sheet are bonded to each other, characterized in that each outer diameter of the first roller and the third roller is the same size, and the third roller is joined to the first roller with a first gear pair (30, 34) therebetween so as to rotate at the same rotation frequency as that of the first roller a first roller having a first outer circumferential face and a plurality of recessed areas retracted from the first outer circumferential face, a second roller (22, 23) disposed so as to be adjacent to the first roller, rotated in synchronization with the first roller and having a second outer circumferential face (22s, 23s) opposed to the first outer circumferential face of the first roller and a plurality of first projections (22a, 23a) that protrude from the second outer circumferential face so as to be inserted into and extracted from the recessed areas of the first roller in a state in which a clearance is provided between each first projection thereof and each recessed area of the first roller, and a third roller disposed so as to be adjacent to the first roller, rotated in synchronization with the first roller and having a third outer circumferential face opposed to the first outer circumferential face of the first roller, wherein a first sheet is fed in between the first roller and the second roller (22, 23) conveyed while being supported by the first outer circumferential face of the first roller and passed through a space between the first roller and the second roller (22, 23), when the first sheet is passed through the space between the first roller and the second roller, the first projections (22a, 23a) of the second roller (22, 23) push the first sheet into the recessed areas (20 a) of the first roller, and thereby the first sheet is shaped, a second sheet is superimposed onto the shaped first sheet and conveyed together with the first sheet and then passed through a space between the first roller and the third roller, when the first sheet and the second sheet are passed through the space between the first roller and the third roller, the first roller and the third roller hold the first sheet and the second sheet therebetween, and thereby the first sheet and the second sheet are bonded to each other, characterized in that each outer diameter of the first roller and the third roller is the same size, and the third roller is joined to the first roller with a first gear pair (30, 34) therebetween so as to rotate at the same rotation frequency as that of the first roller