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PROBLEM TO BE SOLVED : To provide a fiber laser oscillation device that suppresses generation of an excessive peak by making optical intensity distribution of an emitting beam cross-section uniform. SOLUTION : A fiber laser oscillation device includes : a seed light source capable of emitting a seed light; an excitation light source capable of emitting an excitation light; and an optical fiber. The optical fiber has a core in which a rare-earth element capable of absorbing the excitation light is added, and at least an amplifying section capable of amplifying and emitting the seed light incident into the core. The optical fiber includes a first loop which has a first radius larger than a minimum bending radius and a second loop which has a second radius larger than the first radius of the first loop on the amplifying section. COPYRIGHT : (C)2012, JPO&INPIT