An ultrasonic transducer device, comprising: an ultrasonic transducer; a body unit including a housing including a space which is in a front surface of the housing and is for receiving the ultrasonic transducer, and at least one clip part provided to a side surface of the housing; and a fixing member including a fixing plate including a fixing surface to be attached to a rear surface of an exterior panel of a vehicle, and a through hole to communicate to an opening in the exterior panel, and at least one interlocked part removably connected to the at least one clip part so that the space faces the through hole, the at least one clip part including an interlocking part movable between a first position in which the interlocking part is physically connected to the at least one interlocked part and a second position in which the interlocking part is not physically connected to the at least one interlocked part, and a spring part keeping the interlocking part in the first position; wherein: the fixing plate has a shape of a rectangular plate; the fixing plate includes a thick part at a center thereof in a longitudinal direction of the fixing plate; the thick part is greater in thickness than opposite sides of the fixing plate in the longitudinal direction; the through hole is formed in the thick part; the body unit includes a plurality of clip parts; the fixing member includes a plurality of interlocked parts individually corresponding to the plurality of clip parts; and the plurality of interlocked parts are columnar parts which each have a prismatic shape and protrude from a face on an opposite side of the fixing plate from the fixing surface, and protrude from opposite ends of the thick part in a width direction of the fixing plate. an ultrasonic transducer; a body unit including a housing including a space which is in a front surface of the housing and is for receiving the ultrasonic transducer, and at least one clip part provided to a side surface of the housing; and a housing including a space which is in a front surface of the housing and is for receiving the ultrasonic transducer, and at least one clip part provided to a side surface of the housing; and a fixing member including a fixing plate including a fixing surface to be attached to a rear surface of an exterior panel of a vehicle, and a through hole to communicate to an opening in the exterior panel, and at least one interlocked part removably connected to the at least one clip part so that the space faces the through hole, a fixing plate including a fixing surface to be attached to a rear surface of an exterior panel of a vehicle, and a through hole to communicate to an opening in the exterior panel, and at least one interlocked part removably connected to the at least one clip part so that the space faces the through hole, the at least one clip part including an interlocking part movable between a first position in which the interlocking part is physically connected to the at least one interlocked part and a second position in which the interlocking part is not physically connected to the at least one interlocked part, and a spring part keeping the interlocking part in the first position; an interlocking part movable between a first position in which the interlocking part is physically connected to the at least one interlocked part and a second position in which the interlocking part is not physically connected to the at least one interlocked part, and a spring part keeping the interlocking part in the first position; the fixing plate has a shape of a rectangular plate; the fixing plate includes a thick part at a center thereof in a longitudinal direction of the fixing plate; the thick part is greater in thickness than opposite sides of the fixing plate in the longitudinal direction; the through hole is formed in the thick part; the body unit includes a plurality of clip parts; the fixing member includes a plurality of interlocked parts individually corresponding to the plurality of clip parts; and the plurality of interlocked parts are columnar parts which each have a prismatic shape and protrude from a face on an opposite side of the fixing plate from the fixing surface, and protrude from opposite ends of the thick part in a width direction of the fixing plate.