Side structure of vehicle body

A vehicle comprising:

• a vehicle body;
• and
• a pair of side structures respectively provided on both sides of the vehicle body and extending in a vehicle length direction, each of the pair of side structures comprising:
• a side body;
• a plurality of pillars spaced apart on the side body and extending in a vehicle height direction;
• a side sill extending in the vehicle length direction at a lower end of the side body;
• a rear wheel arch on the side body behind the side sill in the vehicle length direction;
• a surround panel coupled to the side body and having an opening;
• and
• a side outer panel coupled to the surround panel, the side outer panel comprising a plastic composite material;
• and
• a water drain unit provided on the surround panel,
• wherein:
• the surround panel comprises a panel mounting part provided at a first outer edge of the opening and bonded to the side outer panel by an adhesive, and
• the water drain unit comprises a water pass part provided on a second outer edge of the panel mounting part.