A vehicle sunroof device has a contact portion between a panel bracket and a guide bracket, an insertion portion, a first member, and a second member. The contact portion contacts a first bracket, which is one of the panel bracket and the guide bracket. The insertion portion protrudes at the contact portion and is inserted into an attachment hole formed in a second bracket, which is the other of the panel bracket and the guide bracket. The first member has a retainer portion that permits a set range of motion of the second bracket. The second member is fastened to the first member. The first and second members permit relative motion of the first and second brackets in the non-fastened state, and restrict relative motion of the first and second brackets in the fastened state.