A vehicle seat comprising a support structure and a first and a second shaped panel (4, 5) supported by the support structure and respectively forming the seat and the backrest of the seat, the support structure comprises a first and a second side support element (6, 7) which extend along opposite sides of the seat and are made each in a single piece; each side support element (6, 7) comprises a first rectilinear section (6a, 7a) and a second rectilinear section (6b, 7b) interconnected with said first section (6a, 7a) through a folded joining area (6c, 7c), each first rectilinear section (6a, 7a) is provided with a first elongated groove that extends along the entire length of the section (6a, 7a) and communicates with the outside; the first grooves are opposite one another and are suitable to house respective first side lips of the first panel which is thus stably held between the first and the second support elements (6, 7); each second rectilinear section (6b, 7b) is provided with a second elongated groove that extends along the entire length of the section (6b, 7b) and communicates with the outside; the second grooves are opposite to one another and are suitable to house respective second side lips of the second panel which is thus stably held between the first and the second support elements (6, 7); characterised in that said support structure further comprises: - a first upper C-shaped connection element comprising a substantially rectilinear central portion and two curved end portions provided with integral appendices respectively stably inserted in an end portion of a second rectilinear section (6b, 7b); - a second lower C-shaped connection element comprising a substantially rectilinear central portion and two curved end portions provided with integral appendices respectively stably inserted in an end portion of a first rectilinear section (6a, 7a); the first and second C-shaped connection elements (30, 36) between them stably connect the first side support element and the second side support element; the second panel has a lower end edge positioned on the side facing the upper edge, opposite to the first connection element; said lower end edge directly hooks onto an end edge of the first panel which is positioned on the opposite side with respect to the edge opposite the second lower C-shaped connection element; the first and the second panels (4, 5) overlap each other at the contact area between the two edges (45, 46). each side support element (6, 7) comprises a first rectilinear section (6a, 7a) and a second rectilinear section (6b, 7b) interconnected with said first section (6a, 7a) through a folded joining area (6c, 7c), each first rectilinear section (6a, 7a) is provided with a first elongated groove that extends along the entire length of the section (6a, 7a) and communicates with the outside; the first grooves are opposite one another and are suitable to house respective first side lips of the first panel which is thus stably held between the first and the second support elements (6, 7); each second rectilinear section (6b, 7b) is provided with a second elongated groove that extends along the entire length of the section (6b, 7b) and communicates with the outside; the second grooves are opposite to one another and are suitable to house respective second side lips of the second panel which is thus stably held between the first and the second support elements (6, 7); - a first upper C-shaped connection element comprising a substantially rectilinear central portion and two curved end portions provided with integral appendices respectively stably inserted in an end portion of a second rectilinear section (6b, 7b); - a second lower C-shaped connection element comprising a substantially rectilinear central portion and two curved end portions provided with integral appendices respectively stably inserted in an end portion of a first rectilinear section (6a, 7a); the first and second C-shaped connection elements (30, 36) between them stably connect the first side support element and the second side support element; the second panel has a lower end edge positioned on the side facing the upper edge, opposite to the first connection element; said lower end edge directly hooks onto an end edge of the first panel which is positioned on the opposite side with respect to the edge opposite the second lower C-shaped connection element; the first and the second panels (4, 5) overlap each other at the contact area between the two edges (45, 46). the first and second C-shaped connection elements (30, 36) between them stably connect the first side support element and the second side support element; the second panel has a lower end edge positioned on the side facing the upper edge, opposite to the first connection element; said lower end edge directly hooks onto an end edge of the first panel which is positioned on the opposite side with respect to the edge opposite the second lower C-shaped connection element; the first and the second panels (4, 5) overlap each other at the contact area between the two edges (45, 46).