An attachment device to a panel hole includes a female part fitted into the panel hole, and having a pass-through part on a side thereof, and a male part having a leg part inserted into the female part. The leg part has an elastic coupling claw projecting outward from the pass-through part to be coupled in the panel hole, and a turn lock part. A guide member is formed in the female part for guiding rotation of the male part. The male part is assembled with the female part to be capable of rotation from a coupled position to an uncoupled position. A turn lock receiving part is formed in the female part and has a lock receiving surface for impeding rotation of the male part toward the uncoupled position.