parking means 2 a tilting means 3 a restoring means 4 a drag means 5 and a lower platform 6 a space 60 defined between the upper parking means 2 and the lower platform 6 is provided for parking a lower car l positioned under an upper car u loaded on the upper parking means 2 the supporting frame 1 includes a base 11 which may be a pair of supporting base portions as shown in fig1 or other modifications a pair of central columns 12 juxtapositionally vertically mounted on the base 11 for pivotally mounting the upper parking means 2 on an upper portion of each central column 12 by a shaft 13 a pair of rear columns 14 juxtapositionally vertically mounted on a rear portion of the base 11 for cooperatively supporting a rear portion of the upper parking means 2 and a pair of reinforcing supporting rods 15 each reinforcing supporting rod 15 secured between an upper portion of each central column 12 and the base 11 each rear column 14 may be provided with a shock absorbing device 141 such as a spring on an upper end of the column 14 for a buffer and shock absorption of the rear portion of the upper parking means 2 when horizontally held on the two rear columns 14 and restored by the restoring means 4 the upper parking means 2 includes a pair of sleeve members 21 each sleeve member 21 pivotally secured on an upper portion of each central column 12 by each shaft 13 and each sleeve member 21 having a cross section of c shape or u.