A nebulizer includes a nebulizer body a relay pipe. The nebulizer body includes a connection portion that has an aerosol lead-out port to lead out aerosol, and the relay pipe includes a connection portion that has an aerosol introduction port to introduce the aerosol. The nebulizer body the relay pipe can take a first connection state in which the relay pipe detachably connected to the nebulizer body and a second connection state in which the relay pipe is connected to the nebulizer body so as to be not able to be detached from the nebulizer body. In the first connection state, the aerosol introduction port and the aerosol lead-out port are communicated with each other. In the second connection state, the aerosol lead-out port is blocked by a blocking portion provided in the relay pipe. Therefore, the nebulizer in which reuse of the nebulizer body or relay pipe is simply prohibited after the usage can be provided by the configuration.
