Provided are a holey fiber which allows leakage light propagating through a cladding to be emitted at a desired position and a laser device which employs the fiber. The holey fiber (50) with one end (58) and the other end (59) has a core (51), an inner cladding (52) for covering the core (51), a hole layer (53) with multiple holes formed therein and for covering the inner cladding, and an outer cladding (54) for covering the hole layer (53). The holey fiber (50) is characterized by a collapsed region (60) in which a hole (56) is collapsed for a predetermined length in the longitudinal direction of the fiber.