To provide a drainage pipe which can prevent such a situation as a work cannot be carried out in a pit because water or sail and sand enters into a pit even when the level of surrounding ground water is high.

The drainage pipe 1 is formed by assembling a tubular body 2, a water stop ball 8 held freely movably in the body 2, upper and lower holding members 3a, 3b fixed, respectively, to the upper and lower parts of the body 2, a water stopping elastic member 5 joining with the water stop ball 8 to close the drain outlet 12 of the upper member 3a, a guide member 7, and a joint member 6.