Accessory device for image-pickup apparatus

An accessory device detachably mounted to an accessory shoe of an image-pickup apparatus, comprising:

• a contact member that electrically connects with the accessory shoe;
• a lock mechanism that allows a lock operation for fixing the accessory device to the accessory shoe and an unlock operation for releasing the fix of the accessory device;
• a drip-proof member that forms a drip-proof space around the contact member and the accessory shoe when the drip-proof member contacts the image-pickup apparatus;
• and
• a moving mechanism that moves, in response to the lock operation, the drip-proof member to a first position where the drip-proof member is allowed to be brought into contact with the image-pickup apparatus, and that moves, in response to the unlock operation, the drip-proof member to a second position where the drip-proof member is retracted from the first position,
• wherein the accessory device is mounted to the accessory shoe in a first direction orthogonal to a second direction in which the drip-proof member moves between the first and second positions, and
• wherein, the drip-proof member has a front-end-side portion and a rear-end-side portion in the first direction and has a shape such that a length of the rear-end-side portion in the second direction is longer than that of the front-end-side portion to avoid at the second position an interference with the accessory shoe during mounting of the accessory device to the accessory shoe.