1. A moving picture coding method for performing inter prediction coding on a coding target block included in a coding target picture, the moving picture coding method comprising: coding the coding target block using a motion vector; generating a plurality of motion vector predictors; and coding the motion vector using one of the plurality of motion vector predictors generated in the generating, wherein, in the generating, a replacement vector which replaces a temporal motion vector predictor is included in the plurality of motion vector predictors when it is impossible to obtain the temporal motion vector predictor from a block which is included in a coded picture different from the coding target picture and corresponds to the coding target block, and in the generating, a motion vector having a motion quantity of 0 is included, as the replacement vector, in the plurality of motion vector predictors when obtainment of the temporal motion vector predictor from the coded picture is prohibited.