A vehicle door operating device includes an opening inside lever connected to an inside handle in a door inside a vehicle, a childproof lock lever that moves between a childproof unlock position and a childproof lock position; a switch lever, a childproof sensor and a single engagement pin. When the childproof lock lever is in the childproof lock position, opening action of the inside handle cannot be transmitted to a door latch device, but can be transmitted to the switch lever. When the childproof lock lever is in the childproof unlock position, releasing action of the opening inside lever can be transmitted to door latch devices for holding a door closed via a single engagement pin, but cannot be transmitted to the switch lever. When the childproof lock lever is in the childproof lock position, the releasing action of the opening inside lever cannot be transmitted to the door latch device via the engagement pin, but can be transmitted to the switch lever.