An assembly comprising a first instrument, a shielded connector unit and a second instrument, the shielded connector unit including: a lower shielded connector to be connected downwards to the lower positioned first instrument; an upper shielded connector (23, 24) to be connected sideways to the second instrument positioned above the first instrument; and a flexible conductive part made up of an electric wire connecting the lower shielded connector to the upper shielded connector (23, 24) and a braid enclosing a bare portion of the electric wire existing between a shielding shell of the lower shielded connector and a shielding shell (26, 27) of the upper shielded connector (23, 24), further comprising: a hard protector (31, 32) made of hard resin enclosing and protecting the conductive part from the outside while ensuring flexibility of at least a portion of the conductive part, characterized in that an interference part is provided at a lower portion of the protector (31, 32) and adapted to interfere with a support provided on the first instrument or the shielding shell of the lower shielded connector when the lower shielded connector is connected to the first instrument, thereby preventing the conductive part and the upper shielded connector (23, 24) from tilting in excess of a certain degree, which would otherwise be caused by flexion of the conductive part protected by the protector (31, 32), the interference part and the support provided on the first instrument or the shielding shell of the lower shielded connector being not interfered when the conductive part and the upper shielded connector (23, 24) being tilted within the angle smaller than the certain degree. a lower shielded connector to be connected downwards to the lower positioned first instrument; an upper shielded connector (23, 24) to be connected sideways to the second instrument positioned above the first instrument; and a flexible conductive part made up of an electric wire connecting the lower shielded connector to the upper shielded connector (23, 24) and a braid enclosing a bare portion of the electric wire existing between a shielding shell of the lower shielded connector and a shielding shell (26, 27) of the upper shielded connector (23, 24), further comprising: a hard protector (31, 32) made of hard resin enclosing and protecting the conductive part from the outside while ensuring flexibility of at least a portion of the conductive part, characterized in that an interference part is provided at a lower portion of the protector (31, 32) and adapted to interfere with a support provided on the first instrument or the shielding shell of the lower shielded connector when the lower shielded connector is connected to the first instrument, thereby preventing the conductive part and the upper shielded connector (23, 24) from tilting in excess of a certain degree, which would otherwise be caused by flexion of the conductive part protected by the protector (31, 32), the interference part and the support provided on the first instrument or the shielding shell of the lower shielded connector being not interfered when the conductive part and the upper shielded connector (23, 24) being tilted within the angle smaller than the certain degree. a hard protector (31, 32) made of hard resin enclosing and protecting the conductive part from the outside while ensuring flexibility of at least a portion of the conductive part, characterized in that an interference part is provided at a lower portion of the protector (31, 32) and adapted to interfere with a support provided on the first instrument or the shielding shell of the lower shielded connector when the lower shielded connector is connected to the first instrument, thereby preventing the conductive part and the upper shielded connector (23, 24) from tilting in excess of a certain degree, which would otherwise be caused by flexion of the conductive part protected by the protector (31, 32), the interference part and the support provided on the first instrument or the shielding shell of the lower shielded connector being not interfered when the conductive part and the upper shielded connector (23, 24) being tilted within the angle smaller than the certain degree.