To provide a method for capable of producing a very thin flat fabric having small so-called textures formed by warp and weft yarns as small as possible and also capable of producing a good fiber-reinforced resin by using the flat fabric, and a method for producing the fiber-reinforced resin.

This method for producing the fabric is provided by lifting up and down weft yarns 1 of a prescribed number, while holding warp yarns 2 at a warp yarn-holding body 6, introducing the warp yarns 2 into and out a gap 5 between the upper and lower weft yarns 1 and formed by lifting up and down of the weft yarns 1 by introducing the warp yarn-holding body 6 into and out the gap, repeating the above to weave a fabric 4 consisting of the weft yarns 1 and warp yarns 2, and also flat-treating the warp yarns 2 in a tension free state just before the introduction of the warp yarns 2 into and out the gap 5 to make flat warp yarns 3 and introducing the warp yarn-holding body 6 holding the flat warp yarns 3 in a state of maintaining the flat state and held on the warp yarn-holding body 6 into and out the gap 5.

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