Slide rail device for vehicle

A slide rail device for use in a vehicle, comprising:

• a lower rail which is mounted to a vehicle floor and extends in forward and rearward directions;
• an upper rail which is mounted to a vehicle seat and extends in said forward and rearward directions;
• and
• a lock mechanism which locks said upper rail to prevent said upper rail from moving in said forward and rearward directions relative to said lower rail and unlocks said upper rail to allow said upper rail to move in said forward and rearward directions relative to said lower rail,
• wherein said lock mechanism comprises:
• a plurality of lock grooves which are formed on said lower rail and arranged in said forward and rearward directions;
• a lock spring support portion which is formed on said upper rail;
• and
• a lock spring which includes:
• a lock portion capable of being engaged with and disengaged from said lock grooves;
• and a supported portion which is supported by said lock spring support portion,
• wherein said lock spring is biased in a direction to bring said lock portion into engagement with said lock grooves and is configured to be capable of bringing said lock portion into engagement with and disengagement from said lock grooves by moving said lock portion in upward and downward directions with said supported portion as a support point, and
• wherein said lock spring support portion of said upper rail comprises an upward-downward movement restriction support portion including:
• an open holding portion which is open at a top thereof and holds said supported portion of said lock spring;
• and an uplift prevention projection which is formed projecting into said open holding portion so as to overlap said supported portion of said lock spring, which is held by said open holding portion, in said upward and downward directions.