Provided are a sealing tape that can prevent tape width misalignment, air bubble inclusion, and creasing even when the sealing tape is affixed in a folded state, a phosphor sheet using the same, a lighting device, a liquid-crystal display, a method for manufacturing a phosphor sheet, and a sealing method. The sealing tape (10) includes an adhesive layer (11), a gas barrier layer (12), a bonding layer (13), and a support film layer (14) laminated in stated order, and has an incision (15) into the support film layer (14) in a thickness direction. The incision (15) is located substantially centrally in a width direction and extends in a longitudinal direction. Accordingly, tape width misalignment, air bubble inclusion, and creasing can be prevented even when the sealing tape is affixed in a folded state.