非常階段 (Hijokaidan, lit. "emergency stairway") is a Japanese noise and free improvisation group with a revolving lineup that has ranged from two members to as many as fourteen in its early days. The group is the project of guitarist Yoshiyuki "Jojo" Hiroshige (Japanese; 広重嘉之, JOJO広重) its one constant member, who is head & owner of the Osaka-based Alchemy Records. Other regulars include Jojo's wife Junko and Toshiji Mikawa (also of Incapacitants).

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