A tape applicator has a handle, a pair of upright plates on the handle, and an accommodation space formed between the pair of upright plates. The handle is coaxially provided with a press member and an operation member. The operation member has a protruding holding plate. The holding plate holds the press member. The user can operate the operation member to turn the press member simultaneously. When the operation member is turned to its extremity, the user can further pull the press rod for the press rod to be further away from the accommodation space. Thus, the distance from the press member to the accommodation space is increased to enhance the use range of the tape applicator for different sizes of tapes.