To provide a method for manufacturing a flexographic printing plate precursor for laser engraving which is suppressed in a residual amount of a radical polymerizable compound and has a sufficiently cured relief formation layer (recording layer).

The method for manufacturing a flexographic printing plate precursor for laser engraving includes; an applying step (1) of applying a composition containing (Component A) the radical polymerizable compound and (Component B) a thermal radical polymerization initiator to a support; and a curing step (2) of thermally curing the composition in an atmosphere in which pressure is adjusted from 0.0001 atm to 0.1 atm.