An apparatus for manufacturing a fiber-reinforced thermoplastic resin tape, the apparatus comprising: a resin impregnation device for impregnating a fiber bundle with a molten thermoplastic resin, the resin impregnation device including a container that accommodates the fiber bundle and the thermoplastic resin with which the fiber bundle is to be impregnated, the container having an outlet allowing the fiber bundle impregnated with the thermoplastic resin to be discharged through the outlet; a nozzle provided to the outlet of the container of the resin impregnation device and configured to allow the fiber bundle having been impregnated with the thermoplastic resin to pass through the nozzle while forming the fiber bundle into a tape shape; and at least one main cooling roller disposed downstream of the nozzle and configured to feed downstream the fiber bundle having passed through the nozzle and cool the fiber bundle while making contact with the tape-shaped fiber bundle, wherein: the nozzle has an opening allowing the fiber bundle to pass through the nozzle, the opening being a rectangular slit (s) having long sides and short sides; and with T (mm) being the dimension of the short sides of a tip of the nozzle and L (mm) being a distance between the tip of the nozzle and the contact position, the dimension T and the distance L in the apparatus satisfy either one of Expression and Expression below: L ≤ 1000 × T − 35; T < 0.08 L ≤ 785.7 × T − 17.9; T ≥ 0.08 characterized by comprising a roller drive unit that rotates the at least one main cooling roller at a peripheral speed of the main cooling roller, the peripheral speed being higher than a travel speed of the fiber bundle. a resin impregnation device for impregnating a fiber bundle with a molten thermoplastic resin, the resin impregnation device including a container that accommodates the fiber bundle and the thermoplastic resin with which the fiber bundle is to be impregnated, the container having an outlet allowing the fiber bundle impregnated with the thermoplastic resin to be discharged through the outlet; a nozzle provided to the outlet of the container of the resin impregnation device and configured to allow the fiber bundle having been impregnated with the thermoplastic resin to pass through the nozzle while forming the fiber bundle into a tape shape; and at least one main cooling roller disposed downstream of the nozzle and configured to feed downstream the fiber bundle having passed through the nozzle and cool the fiber bundle while making contact with the tape-shaped fiber bundle, wherein: the nozzle has an opening allowing the fiber bundle to pass through the nozzle, the opening being a rectangular slit (s) having long sides and short sides; and with T (mm) being the dimension of the short sides of a tip of the nozzle and L (mm) being a distance between the tip of the nozzle and the contact position, the dimension T and the distance L in the apparatus satisfy either one of Expression and Expression below: L ≤ 1000 × T − 35; T < 0.08 L ≤ 785.7 × T − 17.9; T ≥ 0.08 the nozzle has an opening allowing the fiber bundle to pass through the nozzle, the opening being a rectangular slit (s) having long sides and short sides; and with T (mm) being the dimension of the short sides of a tip of the nozzle and L (mm) being a distance between the tip of the nozzle and the contact position, the dimension T and the distance L in the apparatus satisfy either one of Expression and Expression below: L ≤ 1000 × T − 35; T < 0.08 L ≤ 785.7 × T − 17.9; T ≥ 0.08 characterized by comprising a roller drive unit that rotates the at least one main cooling roller at a peripheral speed of the main cooling roller, the peripheral speed being higher than a travel speed of the fiber bundle.