PROBLEM TO BE SOLVED: To provide a high viscosity fluid application device preventing an application face from being stained by leakage of high viscosity fluid after the finish of an application work.SOLUTION: A high viscosity fluid application device 1 comprises: a hand gun 2 having a discharge nozzle 2a discharging high viscosity fluid F; a tube 3 connected to the hand gun 2; a fluid supply part supplying the high viscosity fluid F to the hand gun 2 via the tube 3; and a suction part 5 positioned on the tube 3 and capable of suctioning the high viscosity fluid F within the tube 3.