To reduce transmission of the travel impact to a transmission by a first impact absorbing means to connect a transfer driven gear to one end of a transfer shaft, and a second impact absorbing means to connect a differential drive gear to the other end of the transfer shaft.

A transfer driven gear 1 is mounted on one end of a transfer shaft 3 through a first impact absorbing means, and a differential gear 5 is mounted on the other end of the transfer shaft 3 through a second impact absorbing means. The first impact absorbing means comprises an inner side member 9 to be projected in a hub 7 of the transfer driven gear 1 and a connection groove 11 formed in the transfer shaft 3, and a torsional member 15 is mounted in the gap 13. The second impact absorbing means is provided with an oil chamber 23, and the oil amount to be fed to an oil hole part 29 is adjusted by an orifice 31 to be formed between inner and outer side splines 19, 21 to adjust the impact absorption quantity.