VEHICLE BODY LOWER PORTION STRUCTURE WITH SIDE COLLISION SENSOR

Provided is a vehicle-body lower structure with a side collision sensor which vehicle-body lower structure can attain early sensing by improving a body structure. A first load transmission member (40) of which a longitudinal section has a generally Z-shape is disposed in a closed section (30) of a rocker (12). A first joining portion (40B) of the first load transmission member (40) is joined in a state where the first joining portion is sandwiched between an upper flange (26D) of a rocker outer panel (26) and an upper flange (28D) of a rocker inner panel (28), and a second joining portion (40C) is joined to an intermediate part, in a height direction, of a vertical wall portion (26A) of the rocker outer panel (26). A body portion (40A) connects the first joining portion (40B) and the second joining portion (40C) diagonally, and transmits a load input into the rocker outer panel (26) at the time of a side collision, to an upper-wall-portion-(28B) side of the rocker inner panel (28) by a shortest distance.