PURPOSE: To eliminate erroneous use by displaying vendition suspension at selective buttons equipped with a display part using a vendition suspension switch and making a control part suspend vendition when a door is opened.

CONSTITUTION: When a door 2 is closed, a vendition suspension switch 6 does not detects, but when the door 2 is opened, the vendition suspension switch 6 leaves off from an inner partition plate 7, causing detection. Then a control part 8 is informed of it and vendition suspension 3 is displayed at selective buttons equipped with a display part and vendition is suspended. When the door 2 is closed, the vendition suspension switch 6 hits the inner partition plate 7 to stop detection. The vendition suspension display 3 at selective buttons equipped with a display part disappears and the control part 8 indicates that vendition is allowed. Thus, the vendition suspension switch 6, along with selective buttons equipped with a display part and the control part 8, displays vendition suspension 3 and suspends vendition for eliminating erroneous use in a market.