A catheter and guide wire assembly (10) for measurement of blood pressure in a living body, comprising: a proximal tube (11) having a distal end and a proximal end； a distal tube (12) having a distal end and a proximal end, which is connected to the distal end of the proximal tube (11)；a fluid-permeable coil (13) having a distal end and a proximal end, which is connected to the distal end of the distal tube (12)；a distal tip (14), in which the distal end of the fluid-permeable coil (13) is secured； and a core wire (16), which is attached in the proximal tube (11) and which extends through a portion of the proximal tube (11), the distal tube (12) and the fluid-permeable coil (13), and is secured in the distal tip (14), wherein the distal end of the proximal tube (11) and the proximal end of the distal tube (12) are connected by a butt joint and wherein the core wire (16) is glued or brazed to the inner wall of the proximal tube (11) at or close to the butt joint.
