To provide a branch valve capable of increasing the range of piping design and allowing efficient construction work.

As a piping member provided to be openable and closable, a water stop valve 3 is integrated with a branch base portion between a water hole 21 through which a branch tee passes and a branch water hole 22 perpendicularly branching therefrom, to eliminate intervening members such as pipe nipples so as to reduce the number of part items, while reducing a surface-to-surface distance to reduce the weight of the branch valve. Also, since a flow passage at a branch section can be formed as a flow passage with a smooth curved surface without creating differences in height, foreign matter can be completely removed during sludge removal.