A solid-state laser apparatus includes a cavity 17 for storing a laser diode 40 and a laser medium 6 to be excited by the laser diode 40, and a storage unit 70, for communicating with the cavity 17 and for internally storing a drying agent 71. A moisture permeable film 72 is formed at openings 73 whereat the cavity 17 and the storage unit 70 communicate with each other.

 
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