Apparatus for checking tyres, comprising: - a support frame; - a flange fixed on the support frame for attaching said support frame to a movement member of the apparatus; and - an acquisition system for acquiring three-dimensional images of a surface of a tyre, said acquisition system being mounted on said support frame and comprising: - a matrix camera, having an optical axis, said matrix camera having a sensor with pixels arranged according to a rectangular matrix having two dimensions of comparable length, - a linear laser source adapted to emit a linear laser beam having a propagation plane and a propagation axis, and - a reflecting element having a reflecting surface which intersects both said propagation axis and said optical axis, in a manner so as to respectively identify a first section and a second section of said propagation axis and a first section and a second section of said optical axis, wherein the first section and the second section of the propagation axis are rectilinear sections incident on the reflecting surface in a respective point of incidence, the first section and the second section of the propagation axis mirroring each other with respect to a line perpendicular to the reflecting surface in said respective point of incidence, wherein the first section and the second section of the optical axis are rectilinear sections incident on the reflecting surface in a respective point of incidence, the first section and the second section of the optical axis mirroring each other with respect to a line perpendicular to the reflecting surface in said respective point of incidence, wherein the first sections (14, 16) are respectively situated on the side of the matrix camera and of the linear laser source with respect to the respective point of incidence, wherein a first angle formed between said first section and second section of said optical axis is obtuse, and wherein a second angle formed between said first section and second section of said propagation axis is obtuse. - a support frame; - a flange fixed on the support frame for attaching said support frame to a movement member of the apparatus; and - an acquisition system for acquiring three-dimensional images of a surface of a tyre, said acquisition system being mounted on said support frame and comprising: - a matrix camera, having an optical axis, said matrix camera having a sensor with pixels arranged according to a rectangular matrix having two dimensions of comparable length, - a linear laser source adapted to emit a linear laser beam having a propagation plane and a propagation axis, and - a reflecting element having a reflecting surface which intersects both said propagation axis and said optical axis, in a manner so as to respectively identify a first section and a second section of said propagation axis and a first section and a second section of said optical axis, - a matrix camera, having an optical axis, said matrix camera having a sensor with pixels arranged according to a rectangular matrix having two dimensions of comparable length, - a linear laser source adapted to emit a linear laser beam having a propagation plane and a propagation axis, and - a reflecting element having a reflecting surface which intersects both said propagation axis and said optical axis, in a manner so as to respectively identify a first section and a second section of said propagation axis and a first section and a second section of said optical axis, wherein the first section and the second section of the propagation axis are rectilinear sections incident on the reflecting surface in a respective point of incidence, the first section and the second section of the propagation axis mirroring each other with respect to a line perpendicular to the reflecting surface in said respective point of incidence, wherein the first section and the second section of the optical axis are rectilinear sections incident on the reflecting surface in a respective point of incidence, the first section and the second section of the optical axis mirroring each other with respect to a line perpendicular to the reflecting surface in said respective point of incidence, wherein the first sections (14, 16) are respectively situated on the side of the matrix camera and of the linear laser source with respect to the respective point of incidence, wherein a first angle formed between said first section and second section of said optical axis is obtuse, and wherein a second angle formed between said first section and second section of said propagation axis is obtuse.