WORK MACHINE

A work machine is provided that can discharge water collected inside a casing to the outside, reduce leakage of noise, and reduce entry of foreign matter from outside. [0002] A work machine includes a bottom portion cover 60 forming a portion of a casing 10, and the bottom portion cover 60 includes: at least two ribs 64 and a bead 63 (strengthening structure portions) that are formed substantially perpendicular to a bottom surface of the bottom portion cover 60; and a drain hole 65 located in a connecting portion connecting the bottom surface of the bottom portion cover 60 and a water-discharging rib 64a among the at least two ribs 64. An upper portion of the water-discharging rib 64a is located over the drain hole 65.