The invention relates to a junction structure for connecting two profiles(1, 2), especially in a vehicle support frame. The first profile (1) has at least two planar, parallel sides and the second profile (2) comprises two parallel, opposite girders (3, 4) and at least one strip (5, 6) connecting the girders (3, 4). The girders (3, 4), with their lateral ends, project relative to the strip (5, 6), the projections forming paired, parallel flanges (31, 41, 32, 42). The junction structure is characterized in that the first profile (1) at the location of connection, is provided with a recess (7) into which the second profile (2) is inserted on the front side in such a manner that the parallel sides of the opposite ends (8, 9) of the first profile limiting the recess (7) rest in a form fit against the insides (31a, 41a, 32a, 42a) of the opposite flanges (31, 41, 32, 42) of the second profile (2) and are connected thereto.