To lock/unlock a plurality of kinds of bathroom fittings having lock devices different from each other by a single master key.

A blocking lock system is constituted in such a way that the plurality of kinds of bathroom fittings K, L, M having the lock devices 21, 31 and 41 different from each other can be locked and unlocked from the outside of a room by the single master key 1. The lock devices 21, 31 and 41 are composed of operation knobs capable of operating lock bodies 25, 35 and 45 from the inside of the room and lock release parts constituted so as to be engaged with and disengaged from the lock main bodies 25, 35, and 45 to be operated from the outside of the room. The master key 1 has a plurality of kinds of engaging keys 12, 15 and 16 equivalent to engaging parts of the lock release parts of the plurality of kinds of lock devices 21, 31 and 41.