To provide a fire extinguisher wherein an adhesive can be thoroughly applied extending to the whole of a gap between a male screw 3 on the outer periphery of a mouthpiece section 2 of the fire extinguisher main body 1 and a female screw 22 of a cap nut 20 to bond them, and also, the correction and adjustment for the leakage of an internal pressure after closing the mouthpiece section 2 of the fire extinguisher main body with the valve cap 4 are made possible.

The mouthpiece section 2 of the fire extinguisher main body 1 is closed with the valve cap 4. Then, an adhesive-forcing in hole 23 is provided on the cap nut 20 which clamps and fixes the valve cap 4. The screwing sections of the female thread 22 on the inner periphery of the cap nut 20 and the male thread 3 on the outer periphery of the mouthpiece section 2 are coated and bonded with an adhesive which is quantitatively forced in from the adhesive- forcing in hole 23.