PROBLEM TO BE SOLVED: To provide an injection apparatus which periodically injects a content without needing a power source and efficiently diffuses the content.SOLUTION: An injection apparatus 10 comprises: an aerosol container 11 for storing a content having a pressure; and an injection member 12 which opens an aerosol valve of the aerosol container 11 and fixes the aerosol valve. In the injection apparatus 10, the injection member 12 is provided with a valve structure (a periodic open valve) which stores a predetermined amount of the content and opens when a pressure therein reaches a predetermined pressure. The aerosol container 11 is provided with a flow rate restriction member which restricts a flow rate of the content supplied to the periodic open valve.
