What is claimed is:1. A vehicle equipment control device comprising:a plurality of sets of detection switches mounted on a printed circuit board; anda plurality of key tops arranged in correspondence with the sets of detection switches, each of the sets of detection switches having a plurality of driving pins independently effecting contact switching, each of said key tops having a driving section simultaneously operating at least one of the driving pins of the corresponding detection switch, the driving section having a protruding configuration with a wider width than a sectional width of one of said driving pins,wherein different recognition signals are outputted from the sets of said detection switches while changing a number and an arrangement of the driving pins operated in correspondence with the configurations of the driving sections, and discrimination between control functions set for said key tops is effected on the basis of the different recognition signals.2. A vehicle equipment control device according to claim 1, wherein said detection switch is a multi-type push switch in which a plurality of push switches provided with said driving pins protruded from a casing are stored in said casing.3. A vehicle equipment control device according to claim 1, wherein said detection switch is formed by arranging a plurality of single-pin type push switches each having a single driving pin, each of said detection switches having a same number of driving pins.4. A vehicle equipment control device according to claim 1, wherein the printed circuit board to which said detection switches are mounted is secured in position in a housing, and wherein said housing has guide holes into which the key tops capable of depressing each of the driving pins of said detection switches are slidably inserted, a number of guide holes corresponding to the plurality of sets of detection switches, a stopper step portion being provided on an inner wall of each of the guide holes, each key top having a side surface with a stopper claw portion to be engaged with said stopper step portion to prevent the key top from being detached from the guide hole.5. A vehicle equipment control device according to claim 4, wherein a coil is provided between each key top and a bottom surface of said housing to bias said key top upwardly.6. A vehicle equipment control device according to claim 1, wherein one of the control functions set for the key tops is a control function for traction control.7. A vehicle equipment control device according to claim 1, wherein one of the control functions set for the key tops is a control function for suspension control.8. A vehicle equipment control device according to claim 1, wherein one of the control functions set for the key tops is a control function for a driver's seat heater.9. A vehicle equipment control device according to claim 1, wherein one of the control functions set for the key tops is a control function for a driver's seat backrest heater.10. A vehicle equipment control device according to claim 1, wherein one of the control functions set for the key tops is a control function for a heater for the seat next to the driver's seat.11. A vehicle equipment control device according to claim 1, wherein one of the control functions set for the key tops is a control function for a heater for the backrest of the seat next to the driver's seat.12. A vehicle equipment control device according to claim 1, wherein one of the control functions set for the key tops is a control function for mirror tuck-away operation.