Abstract: Structure for fixing a large solar module (12) to a substructure (14), having at least two retaining profile-members (26) which can be fixed to a component from the solar module (12) and substructure (14) at the rear, characterised by at least two receiving profile-members (60) which can be fixed to the other component from the solar module (12) and substructure (14) in a mutual relative position which corresponds to the relative position of the retaining profile-members (26), the retaining profile-member (26) and the receiving profile-member (60) having a mutually complementary profile shape so that the retaining profile-member (26) can be received in a substantially positive-locking manner in the receiving profile-member (60), there being provided, on at least one pair comprising a mutually engaging retaining profile-member (26) and receiving profile-member (60), mutually corresponding engagement formations, by means of which the retaining profile-member (26) and the receiving profile-member (60) engage wit