Folding support structure comprising a set of coplanar support points, including at least two rear support points and at least one front support point, characterised in that it comprises at least one folding device comprising: • a set of lower arms (12, 13) comprising at least one front arm and one rear arm, each comprising a first end (R1, R2 respectively), each being connected to a support point; • a set of upper arms (11, 14) comprising at least one front upper arm and one rear upper arm; • a first antiparallelogram (CDEF) that can deform in a vertical plane, said at least one first antiparallelogram (CDEF) comprising two crossed segments (CD, EF) with: • a first end and a second end each being fixed by a first and a second attachment to a first end of the front lower arm and a first end of the rear lower arm respectively; • a third end and a fourth end each being fixed by a third and a fourth attachment to a first point of the front lower arm and a first point of the rear lower arm respectively; • at least one first lateral bar located in the vertical plane, said bar: • being fixed by means of a fifth attachment by a first end of said first lateral bar to the first end of the front lower arm; • being fixed by means of a sixth attachment to the rear upper arm at a first upper point such that the length of the first lateral bar is approximately the same as the first segment formed by the second end and the third end of the first antiparallelogram (CDEF) and approximately parallel to said first segment. • a second lateral bar, said second lateral bar: • being fixed by means of a seventh attachment by a first end of said second lateral bar to the first end of the rear lower arm; • being fixed by means of an eighth attachment to the front upper arm at a second upper point such that the length of the second lateral bar is approximately the same as the length of the second segment formed by the first end and the fourth end of the first antiparallelogram (CDEF) and approximately parallel to said second segment, the first antiparallelogram (CDEF) deforming by folding between a first position (POS_3) of the structure called the unfolded position, and a second position (POS_7) called the folded position, changing from the first position to the second position causing a reduction in the base width of the structure. • a set of lower arms (12, 13) comprising at least one front arm and one rear arm, each comprising a first end (R1, R2 respectively), each being connected to a support point; • a set of upper arms (11, 14) comprising at least one front upper arm and one rear upper arm; • a first antiparallelogram (CDEF) that can deform in a vertical plane, said at least one first antiparallelogram (CDEF) comprising two crossed segments (CD, EF) with: • a first end and a second end each being fixed by a first and a second attachment to a first end of the front lower arm and a first end of the rear lower arm respectively; • a third end and a fourth end each being fixed by a third and a fourth attachment to a first point of the front lower arm and a first point of the rear lower arm respectively; • a first end and a second end each being fixed by a first and a second attachment to a first end of the front lower arm and a first end of the rear lower arm respectively; • a third end and a fourth end each being fixed by a third and a fourth attachment to a first point of the front lower arm and a first point of the rear lower arm respectively; • at least one first lateral bar located in the vertical plane, said bar: • being fixed by means of a fifth attachment by a first end of said first lateral bar to the first end of the front lower arm; • being fixed by means of a sixth attachment to the rear upper arm at a first upper point such that the length of the first lateral bar is approximately the same as the first segment formed by the second end and the third end of the first antiparallelogram (CDEF) and approximately parallel to said first segment. • being fixed by means of a fifth attachment by a first end of said first lateral bar to the first end of the front lower arm; • being fixed by means of a sixth attachment to the rear upper arm at a first upper point such that the length of the first lateral bar is approximately the same as the first segment formed by the second end and the third end of the first antiparallelogram (CDEF) and approximately parallel to said first segment. • a second lateral bar, said second lateral bar: • being fixed by means of a seventh attachment by a first end of said second lateral bar to the first end of the rear lower arm; • being fixed by means of an eighth attachment to the front upper arm at a second upper point such that the length of the second lateral bar is approximately the same as the length of the second segment formed by the first end and the fourth end of the first antiparallelogram (CDEF) and approximately parallel to said second segment, • being fixed by means of a seventh attachment by a first end of said second lateral bar to the first end of the rear lower arm; • being fixed by means of an eighth attachment to the front upper arm at a second upper point such that the length of the second lateral bar is approximately the same as the length of the second segment formed by the first end and the fourth end of the first antiparallelogram (CDEF) and approximately parallel to said second segment,