Abstract: A retainer apparatus for securing a bed liner to a pickup truck bed having either an inwardly or outwardly extending top bed rail. The pickup truck bed has a plurality of bed holes and the bed liner has a plurality of liner holes. The retainer apparatus includes a front tie-down ring retaining plate for positioning between the pickup truck bed and the bed liner. The front tie-down ring retaining plate has a first end and an opposing second end. The first end has at least one hole therethrough for alignment with one of the bed holes. The first end is secured to one of the bed holes. The second end has at least one hole therethrough for alignment with one of the holes in the bed liner. The second end secured is to the one of the holes in the bed liner. The apparatus also includes a rear tie-down ring retaining plate for positioning between the pickup truck bed and the bed liner. The front tie-down ring retaining plate has a first end and an opposing second end.