An ultrasound transducer module according to the present invention includes an ultrasound transducer, a substrate, and a casing. The ultrasound transducer transmits and receives ultrasound on a plane that includes a longitudinal axis of an insertion portion and is parallel to the longitudinal axis. The substrate is provided on a side opposite to the surface on which the ultrasound is transmitted and received. The substrate is electrically connected with the ultrasound transducer and includes a first wiring pad at a portion different from a connection portion with the ultrasound transducer. The casing includes an accommodation hole for accommodating the ultrasound transducer and the substrate, and a holding hole continued to the accommodation hole and capable of holding a portion of the substrate. The casing includes a plurality of electrode pads and a plurality of second wiring pads. The electrode pads are provided on an outer peripheral surface of the casing. Each second wiring pad is provided in the holding hole, electrically connected with a corresponding electrode pad among the plurality of electrode pads, and electrically connected with the first wiring pad.
