It is an object of the invention to provide a chassis structure for vehicles that can effectively absorb an impact. Side members extend in a longitudinal direction of a vehicle body along the sides of the vehicle body. The side members are made to buckle in the longitudinal direction upon receiving an impact. A cross member extends between the side members along the width direction of the vehicle body. Coupling rods are supported by the side members via support members. The cross member is fixed to tips of the coupling rods by bolts. When an impact exceeding a predetermined level is exerted on the cross member in the longitudinal direction, the support members are broken, whereby the cross member and coupling rods are detached from the side members.