To prevent malfunction in the opening/closing of an opening/closing door caused by the displacement of the shaft of the opening/closing door of a winning device.

A large winning device 1 comprises the opening/closing door 3 which is rotatable forward/backward and a driving part 4 to rotate the opening/closing door 3 forward/backward in a ball entrance 2. The large winning device 1 also has a case part 5 to which the opening/closing door 3 and the driving part 4 are attached; a shaft hole part 7 which is integrally formed with a front face part 50 of the case part 5 and in which a shaft hole 6 is horizontally formed in the left/right direction; and a door pin 8 one end 80 of which is fitted into the shaft hole 6 and the other end 81 of which is slackly fitted into a shaft hole 31 of a shaft hole part 30 of the opening/closing door 3. The case part 5 is divided into an upper case 51 and a lower case 52 which are detachably fitted to each other with screws. A shaft hole part 7 is formed on a fitting face 54 of the lower case 52. The driving part 4, a ball detection part 9 and a relay board 10 connected to the ball detection part 9, etc. are assembled inside the case part 5, and a mounting part 12 to be attached to a mounting board 11 is disposed in the case part 5.