a touch panel; and

an interlayer filling material for the touch panel comprising a polyvinyl butyral, a plasticizer, and an organic acid,

1) filling at least one interlayer space selected from the group consisting of an interlayer space between a surface protection panel and the touch panel, an interlayer space between the touch panel and a polarizing film, and an interlayer space between transparent conductive films included in the touch panel with the interlayer filling material to produce a stack,

2) performing preliminary heat-bonding of the stack at about 70° C.,

3) followed by an autoclave treatment of the stack at 70° C. to 85° C. and 0.5 MPa or more for 30 minutes,

4) then decompressing the stack after cooling to 30° C. or lower to produce the laminate,

wherein:

the plasticizer is at least one selected from the group consisting of triethylene glycol-di-2-ethylhexanoate, tetraethylene glycol-di-2-ethylhexanoate, triethylene glycol-di-pivalate, and di-(2-butoxyethyl)adipate,

the organic acid is at least one selected from the group consisting of 2-ethylhexanoic acid, adipic acid, and phthalic acid,

an amount of the plasticizer in the interlayer filling material for the touch panel is 5 to 45 parts by weight relative to 100 parts by weight of the polyvinyl butyral,

an amount of the organic acid in the interlayer filling material for the touch panel is 0.01 to 5 parts by weight relative to 100 parts by weight of the polyvinyl butyral, and

the polyvinyl butyral contains 16 to 45 mol % hydroxy groups, a degree of acetylation of 0.1 to 30 mol %, and a degree of butyralization of 50 to 85 mol %.