Lock apparatus of seat for vehicle

A lock apparatus of a seat for a vehicle includes a striker, a first plate including a first plate groove portion, a second plate including a second plate groove portion, plural fixing portions provided at the first and second plates, a hook member being pivotable between a lock release position and a lock position and including a hook groove portion with and from which the striker is engageable and releasable, a pawl member engageable with and releasable from the hook member, a biasing member biasing the hook member and the pawl member, and plural connecting portions provided at the first and second plates for connecting the first and second plates. The connecting portions are located at an area defined between the fixing portions and one side portion of the first and second plates opposite to another side portion at which the first and second plate groove portions are formed.