To provide a resin sash capable of making strength sufficient in a connecting part of mutual frame members in a resin frame member body.

This resin sash is formed by storing sash windows 2 and 3 in a square frame body 1. The sash windows 2 and 3 are composed of an indoor resin frame member body 6 of assembling an indoor top rail 20, an indoor bottom rail 21 and right-left indoor stiles 22 each of which composed of a synthetic resin in a square shape as a frame member, an outdoor resin frame member body 7 of assembling an outdoor top rail 30, an outdoor bottom rail 31 and right-left outdoor stiles 32 each of which composed of a synthetic resin in a square shape as a frame member, and a metallic connecting frame member body 8 arranged between the outdoor resin frame member body 7 and the indoor resin frame member body 6 and connecting both resin frame member bodies.

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