To provide a safe two-wheeler with less stagger and overturning during traveling, even if cargoes and children are put in front part and rear part of the two-wheeler.

Front part deck stay 2 and rear part deck stay 3 are installed in a vehicle body frame 1 of the two-wheeler. Deck frames 6 are mounted in upper parts of the front part and rear part deck stays 2 and 3. Each of auxiliary stays 4 and 5 is installed to reinforce strength of the front part and rear part of the deck frame 6. Fixed ends of the front part and rear part deck stays 2 and 3 are fixed in cantilever to a stay fixing bracket 12 in the lower part of the vehicle body frame 1, each part is not brought into contact with any part of the vehicle body frame 1, and thereby weight concentrates on the stay fixing bracket 12. When cargoes and children are put on the deck frame 6, the load concentrates in an intermediate part of a front wheel and a rear wheel in a lower part of the vehicle body frame 1, and a center of gravity becomes a lower position. As a result, stagger and overturning during traveling can be reduced as compared with the case where the equivalent load is applied to the front wheel part and the rear wheel part in a conventional two-wheeler.