The present invention provides a cover body for airbag device that is capable of easily mounting an emblem that is provided with an emblem body having a narrow portion while ensuring its related mounting strength. A lock pin is protruded at a main body portion with a relatively large width of the emblem body. A hook pin is protruded at a narrow portion with a relatively small width of the emblem body. The lock pin is inserted into a first door portion and then is inserted into a thorough hole of a back plate on a rear face side. The hook pin is inserted into the first door portion, and is hooked therewith.