A spout nozzle for a scum removal device which removes scum by spouting pressure water in water where the scum floats, comprising a nozzle body having an inlet-side housing part into which the pressure water is supplied, and a tip-end-side nozzle part communicated with the inlet-side housing part and formed into a flat cylindrical shape in which a width is larger than a height, and a valve body provided in the tip-end-side nozzle part of the nozzle body and can open/close an opening of the tip-end-side nozzle part, wherein the valve body has a valve main body part formed in a plate shape; a base end part of the valve main body part is rotatably held on a vicinity of an upper wall of a base end part of the tip-end-side nozzle part via a hinge shaft along the width direction; a tip end of the valve main body part is arranged in an opening of the tip-end-side nozzle part, with being vertically movable between a position of forming an upper opening above the valve main body part by being in contact with an upper surface of a lower wall of the tip-end-side nozzle part and a position forming a lower opening below the valve main body part by being in contact with a lower surface of an upper wall of the tip-end-side nozzle part; the valve main body part is rotated downward by its own weight and close the lower opening when the pressure water is not supplied to the inlet-side housing part and of being rotated upward by a pressure of the pressure water and open the lower opening when the pressure water is supplied, a closing part is provided at the tip end part of the valve main body part to stand up upward at a position of protruding from the opening, the closing part is formed in size of closing the upper opening formed between the valve body and the lower surface of the upper wall of the tip-end-side nozzle part when the valve body closes the lower opening. the valve body has a valve main body part formed in a plate shape; a base end part of the valve main body part is rotatably held on a vicinity of an upper wall of a base end part of the tip-end-side nozzle part via a hinge shaft along the width direction; a tip end of the valve main body part is arranged in an opening of the tip-end-side nozzle part, with being vertically movable between a position of forming an upper opening above the valve main body part by being in contact with an upper surface of a lower wall of the tip-end-side nozzle part and a position forming a lower opening below the valve main body part by being in contact with a lower surface of an upper wall of the tip-end-side nozzle part; the valve main body part is rotated downward by its own weight and close the lower opening when the pressure water is not supplied to the inlet-side housing part and of being rotated upward by a pressure of the pressure water and open the lower opening when the pressure water is supplied, a closing part is provided at the tip end part of the valve main body part to stand up upward at a position of protruding from the opening, the closing part is formed in size of closing the upper opening formed between the valve body and the lower surface of the upper wall of the tip-end-side nozzle part when the valve body closes the lower opening.