A method of manufacturing a laminate film comprising an elongated release film and a plurality of insular adhesive films, the insular adhesive film being either an insular adhesive film A or an insular adhesive film B which are adjacent to each other on the release film along a lengthwise direction thereof, the method comprising: obtaining an elongated laminate comprising the elongated release film and an elongated adhesive film, precutting the adhesive film in the laminate to thereby obtain a first peeling part surrounded by a cut line, peeling off the first peeling part from the release film, precutting the adhesive film in the laminate to thereby obtain a second peeling part surrounded by a cut line, and peeling off the second peeling part from the release film, wherein: the first peeling part includes a peripheral part A1 of the insular adhesive film A at one widthwise end side of the release film, a peripheral part B2 of the insular adhesive film B at the other widthwise end side of the release film and a connection part C connecting the peripheral part A1 and the peripheral part B2, but does not include a peripheral part A2 of the insular adhesive film A at the other widthwise end side of the release film and a peripheral part B1 of the insular adhesive film B at the one widthwise end side of the release film, and the second peeling part is provided at the other widthwise end side of the release film as defined for the first peeling part, and includes a peripheral part A2 of the insular adhesive film A at the other widthwise end side of the release film, an outer peripheral part B2' provided adjacent to the outer periphery of a peripheral part B2 of the insular adhesive film B at the other widthwise end side of the release film and a connection part C2 connecting the peripheral part A2 and the outer peripheral part B2'. obtaining an elongated laminate comprising the elongated release film and an elongated adhesive film, precutting the adhesive film in the laminate to thereby obtain a first peeling part surrounded by a cut line, peeling off the first peeling part from the release film, precutting the adhesive film in the laminate to thereby obtain a second peeling part surrounded by a cut line, and peeling off the second peeling part from the release film, the first peeling part includes a peripheral part A1 of the insular adhesive film A at one widthwise end side of the release film, a peripheral part B2 of the insular adhesive film B at the other widthwise end side of the release film and a connection part C connecting the peripheral part A1 and the peripheral part B2, but does not include a peripheral part A2 of the insular adhesive film A at the other widthwise end side of the release film and a peripheral part B1 of the insular adhesive film B at the one widthwise end side of the release film, and the second peeling part is provided at the other widthwise end side of the release film as defined for the first peeling part, and includes a peripheral part A2 of the insular adhesive film A at the other widthwise end side of the release film, an outer peripheral part B2' provided adjacent to the outer periphery of a peripheral part B2 of the insular adhesive film B at the other widthwise end side of the release film and a connection part C2 connecting the peripheral part A2 and the outer peripheral part B2'.