Provided are a laser tip, a laser treatment tool, a laser treatment device and a laser treatment system safely performing a surgery for a laser treatment and, if bleeding occurs, stopping the bleeding. A laser tip 70 is attachable to a laser radiation opening 63a provided at a tip end of a laser transmission tube 63. From the laser radiation opening 63a, laser light 57a is directed. The laser tip 70 includes a laser transmission tube attaching portion 71 detachable from the laser radiation opening 63a； a contact portion 72 contactable with a biological tissue, the contact portion 72 being provided to the front of the laser transmission tube attaching portion 71 in a direction in which the laser light 57a is directed from the laser radiation opening 63a, with an open space S being provided between the contact portion 72 and the laser transmission tube attaching portion 71； a coupler 73 coupling a part of the contact portion 72 and a part of the laser transmission tube attaching portion 71 to each other； the contact portion 72 having a reflective surface 72b at a rear end thereof, the reflective surface 72b reflecting the laser light 57a, directed forward from the laser radiation opening 63a, toward the coupler 73.
