Nebulizer kit and nebulizer

A nebulizer kit comprising:

• a housing body that houses an atomizer configured to atomize a liquid, the housing body including a first opening and a second opening;
• a mouthpiece integrally including a first attachment and a tubular second attachment, the first attachment including a first check valve, the first attachment being configured to be attachable to and detachable from the first opening, the tubular second attachment including a second check valve, the tubular second attachment configured to be attachable to and detachable from the second opening, and an entirety of the first attachment is movable relative to an entirety of the second attachment;
• and
• an inhalation attachment different from the mouthpiece attachable to the second opening in a state in which the mouthpiece is removed from the housing body;
• wherein
• when the mouthpiece is used, the first attachment of the mouthpiece is directly attached to the first opening while the tubular second attachment of the mouthpiece is directly attached to the second opening.