An assembly for detecting defects on a bodywork of a motor vehicle , its understructure and its tires, comprising a portal , of inverted U-shaped cross section, shaped to allow the passage of said motor vehicle in a longitudinal direction (X), from the rear of the portal to the front of the portal ; said portal comprising an inner surface extending transversely (Y) between two lateral free ends and comprising a light source suitable for illuminating, in a substantially uniform manner, the bodywork of the motor vehicle during its passage, said portal comprising at least one opaque strip extending transversely (Y) over the entire length of the inner surface ; said assembly comprising a plurality of cameras (30-45) installed at a distance from the portal , in at least one longitudinal direction (X), so as to capture images of the bodywork of the motor vehicle during its passage under the portal , and a detection member suitable for receiving said images captured by said plurality of cameras (30-45) and for detecting, according to these images, defects in the bodywork, on the one hand by analyzing the reflection of the opaque strip on the bodywork and, on the other hand, by directly recognizing, in said images, defects highlighted by observing the reflection of the light source on the bodywork; said assembly comprising, on each side of the portal , a rear attachment structure extending to the rear of the portal , parallel to the longitudinal direction (X), and suitable for allowing the attachment of at least some of the plurality of cameras (31-38) forming rear detection cameras, which are oriented so as to acquire images of the side and rear faces of the motor vehicle as it passes through said portal ; said assembly comprising on the upper portion of the portal , one attachment structure for a mirror , extending to the front of the portal , and another attachment structure for attaching cameras (41-43) of the plurality of cameras forming upper cameras (41-43), which are oriented substantially parallel to the longitudinal axis (X) in the direction of the mirror , said mirror having an angle suitable for allowing the reflection, toward said upper cameras, of an image of the upper portion of the motor vehicle as the latter passes through said portal . said assembly comprising, on each side of the portal , a rear attachment structure extending to the rear of the portal , parallel to the longitudinal direction (X), and suitable for allowing the attachment of at least some of the plurality of cameras (31-38) forming rear detection cameras, which are oriented so as to acquire images of the side and rear faces of the motor vehicle as it passes through said portal ; said assembly comprising on the upper portion of the portal , one attachment structure for a mirror , extending to the front of the portal , and another attachment structure for attaching cameras (41-43) of the plurality of cameras forming upper cameras (41-43), which are oriented substantially parallel to the longitudinal axis (X) in the direction of the mirror , said mirror having an angle suitable for allowing the reflection, toward said upper cameras, of an image of the upper portion of the motor vehicle as the latter passes through said portal . <EOS>