A bumper member at a vehicle frontmost end is joined to side members. The bumper member has a curved shape, a center portion protrudes further to the vehicle front than a tip end portion of the side member, a projecting portion is positioned on the outer side of the tip end portion, and is curved toward the vehicle rear, a protruding part extending toward the side member is provided on an inner side of the projecting portion, a tip end portion on the inner side of the protruding part has a planar portion opposite a side face portion on the outer side of the side member, a protrusion protruding to the inner side from the planar portion and extending in the longitudinal direction is provided in the planar portion, and a slit-shaped opening into which a tip end of the protrusion is inserted is provided in the side face portion.