an ultrasound probe system includes a main body portion , an ultrasound observation portion transmitting ultrasound in a side surface direction of the main body portion and receiving a reflected wave , a distal - end portion provided such that a proximal - end face , on a proximal - end side is adjacent to a distal - end in an axial direction of the main body portion , a sheath portion housing the main body portion inside to be capable of advancing and retracting in the axial direction , a distal - end face arranged at a distal - end of the sheath portion and facing the proximal - end face , a specimen collecting portion provided on the proximal - end face and / or the distal - end face , the specimen collecting portion being formed at an acute angle to separate a specimen from a subject , and an edge portion arranged on the proximal - end face or the distal - end face to cross the entire circumference of the specimen collecting portion to cut the specimen .