A flow phenomenon measuring device (1) includes an optical fiber probe (10), a light source section (20), a light receiving section (30),and an analyzing section (40). The optical fiber probe (10) is constituted by processing an optical fiber (11) extending between a first end (11a) and a second end (11b), and has a first detecting part (14) and a second detecting part (15) on the first end (11a) side. The first detecting part (14) and the second detecting part (15) are provided at positions spaced apart from each other in the axial direction of the fiber. In each of the first detecting part (14) and the second detecting part (15), reflectance of waveguide light traveling from the second end (11b) toward the first end (11a) of the optical fiber (10) depends on the refractive index of a contact object. Consequently, a device, a method, and an optical fiber probe where a flow phenomenon can be measured with high precision even when the diameter of a bubble in a liquid layer or a liquid droplet in a gas layer is small, are ensured.
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