An ultrasound probe, comprising: a probe main body; a plurality of ultrasonic transducers which are arranged along a predetermined direction; an optical fiber that guides light emitted from a light source to said probe main body; and at least two light guiding means (11, 60, 70, 80, 90) provided to face each other with the ultrasonic transducers interposed therebetween, adapted to guide light from a light input end which is optically coupled with the optical fiber to a light output end provided in the vicinity of the ultrasonic transducers; the light guiding means (11, 60, 70, 80, 90) including: a first light guiding portion formed by a glass material that includes the light input end and guides light from the light input end toward the light output end and that enlarges the cross sectional area of input light at the light input end at an output end of the first light guiding portion; and a second light guiding portion formed by a resin material that includes the light output end, guides light guided by the first light guiding portion to the light output end, and emits light from the light output end toward a subject, characterized in that the light guiding means (11, 60, 70, 80, 90) is provided inclined at a predetermined angle with respect to ultrasonic wave detecting surfaces of the ultrasonic transducers such that the light output from the light guiding means will propagate in directions toward the ultrasonic transducers, and that the first light guiding portion includes a light guiding path formed in a tapered shape. a probe main body; a plurality of ultrasonic transducers which are arranged along a predetermined direction; an optical fiber that guides light emitted from a light source to said probe main body; and at least two light guiding means (11, 60, 70, 80, 90) provided to face each other with the ultrasonic transducers interposed therebetween, adapted to guide light from a light input end which is optically coupled with the optical fiber to a light output end provided in the vicinity of the ultrasonic transducers; the light guiding means (11, 60, 70, 80, 90) including: a first light guiding portion formed by a glass material that includes the light input end and guides light from the light input end toward the light output end and that enlarges the cross sectional area of input light at the light input end at an output end of the first light guiding portion; and a second light guiding portion formed by a resin material that includes the light output end, guides light guided by the first light guiding portion to the light output end, and emits light from the light output end toward a subject, a first light guiding portion formed by a glass material that includes the light input end and guides light from the light input end toward the light output end and that enlarges the cross sectional area of input light at the light input end at an output end of the first light guiding portion; and a second light guiding portion formed by a resin material that includes the light output end, guides light guided by the first light guiding portion to the light output end, and emits light from the light output end toward a subject, characterized in that the light guiding means (11, 60, 70, 80, 90) is provided inclined at a predetermined angle with respect to ultrasonic wave detecting surfaces of the ultrasonic transducers such that the light output from the light guiding means will propagate in directions toward the ultrasonic transducers, and that the first light guiding portion includes a light guiding path formed in a tapered shape.