A tape printing device that executes printing on a tape-like printing medium includes an input portion that receives input of a character string and designation of a printing condition, a controller, a storage portion storing at least one definition table that is used when particular printing is executed in which sizes of respective characters included in the character string are stepwise changed to print the character string and that defines the sizes of the respective characters included in the character string in correspondence with the number of characters in the character string and a width of the printing medium, and a printing portion. The controller, when the printing condition designates the particular printing, sets the sizes for the respective characters included in the character string based on the definition table, and generates specific print data indicating that each character is to be printed in the size set for the character.