Longitudinal adjuster and vehicle seat

A vehicle seat comprising:

• a seat frame side part;
• and
• a longitudinal adjuster comprising:
• at least one rail pair comprising a first seat rail for connection to a seat frame side part, and a second seat rail for connection to a vehicle structure, wherein the seat rails of the seat rail pair are displaceable relative to one another in a longitudinal direction and engage one another and form an internal channel;
• an anchor fixed to the second seat rail, in the internal channel;
• a reinforcement profile fixed to the first seat rail in the internal channel, wherein the reinforcement profile and the anchor are spaced apart from one another in a normal situation and engage with one anchor, in reaction to a predefined application of force, wherein the reinforcement profile has a connection portion which is led rearwardly out of the internal channel and which is connectable to a rear end of a seat frame side part, wherein the seat frame side part is connected to the first seat rail;
• either wherein:
• the connection portion has a recess and the seat frame side part has a projection;
• and
• in a mounted state, the projection of the seat frame side part engages into the recess of the connection portion of the reinforcement profile;
• or wherein:
• the connection portion has a projection and the seat frame side part has a recess;
• and
• in the mounted state, the projection of the connection portion of the reinforcement profile engages the recess of the seat frame side part.