To provide a flip-up gate which prevents an appearance of a door body from being deteriorated by a weight, by facilitating the addition or removal of the weight, which prevents a rise in product price by enabling both a stile and caps at upper and lower ends of the stile to employ conventional products as-is, and which is not affected even when an end of a fence gets close to both the right and left sides of the door body in a closing position.

A weight mounting unit includes a weight mounting base material, the weight which is annexed to the weight mounting base material, and a fixing means for fixing the plurality of weights in the state of annexing the weights to the weight mounting base material and making them overlap the weight mounting base material. The weight mounting base material is formed in a batten plate shape akin to a shape of an outside vertical wall among vertical walls forming hollow portions of the right and left stiles of the door body, inserted into the hollow portion of the stile, and mounted on the stile by means of a screw screwed from the outside of the outside vertical wall. Any one of the weights is formed like the batten plate. A common member as the fixing means is used for any one of the weights, and makes the weights fixed in the state of being annexed and superposed on the weight mounting base material.

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