Locking member, mixing tip, and double syringe

A locking member that locks a mixing nozzle coupled to a cartridge that includes two syringes accommodating different materials, the mixing nozzle being configured to mix the materials pushed out from the two syringes in a nozzle and discharge the materials, the locking member comprising:

• a support rod supported by the mixing nozzle so as to be displaceable in a direction orthogonal to a direction in which the nozzle extends, the support rod having a top end and a bottom end;
• a first engaging part that protrudes from the top end of the support rod toward an opposite side to the nozzle, and that is displaced toward the bottom end of the support rod to be engaged with one of two horizontal parts that are provided so as to be bridged across the two syringes;
• a second engaging part that protrudes from a position of the support rod that is closer to the bottom end of the support rod than the first engaging part, toward the opposite side to the nozzle, and that is inserted in between the two horizontal parts and displaced toward the bottom end of the support rod to be engaged with another one of the two horizontal parts;
• a first inclined part that is provided between the first engaging part and the second engaging part;
• a second inclined part that is provided between the second engaging part and the bottom end of the support rod, wherein
• each of the first inclined part and the second inclined part has an upper end that connects with the support rod at a first inclined angle (α) with respect to the direction in which the nozzle extends, and
• the first inclined part has a lower end that is inclined toward the opposite side to the nozzle and connects with the second engaging part,
• the second inclined part has a lower end that is inclined toward the opposite side to the nozzle and connects with the bottom end of the support rod, and
• the lower end of the first inclined part and of the second inclined part is connected to the second engaging part and the bottom end of the support rod, respectively, at a second inclined angle (β), smaller than the first inclined angle (α), with respect to the direction in which the nozzle extends.