Steering system

A steering system including a rack housing and a drainage device, wherein the drainage device includes:

• a drainage case having a case inlet port communicated with a housing space of the rack housing, a case outlet port communicated with an outside of the rack housing, a drainage space communicated with the case inlet port and the case outlet port, and a case bottom face that faces the drainage space;
• and
• a drainage valve arranged in the drainage space and having a hollow shape, the drainage valve having a valve body inlet port portion communicated with the case inlet portion, and a valve body outlet port portion that is made of a resin and interrupts communication between the case inlet port and the case outlet port when the valve body outlet port portion comes into contact with the case bottom face, wherein:
• the valve body outlet port portion is configured to deform and form a passage between the case bottom face and the valve body outlet port portion, and
• the drainage valve is configured such that water flowing through the hollow shape of the drainage valve exerts sufficient pressure on the valve body outlet port portion to deform the valve body outlet port portion and form the passage.