A printer comprising: a print execution unit configured to execute a printing operation; and a control device configured to operate as: an original data acquisition unit configured to acquire original data, which is designated as a print target by a specific user and comprises identification information for identifying the specific user; a generation unit configured to sequentially convert each of partial original data of a plurality of pages included in the original data so as to sequentially generate each of partial print data of the plurality of pages in a memory of the printer; a supply unit configured to sequentially supply each of the partial print data of the plurality of pages sequentially generated in the memory to the print execution unit; and a confirmation unit configured to, whenever the partial print data of one page is generated in the memory, confirm whether the specific user is present in the vicinity of the printer by using the identification information, wherein in a first situation (S22:YES) where it is confirmed that the specific user is present in the vicinity of the printer when first partial print data, which is the partial print data of one page, is generated in the memory, the supply unit is configured to supply the first partial print data which is stored in the memory to the print execution unit, characterized in that the generation unit is configured to generate second partial print data in the memory after the first partial print data is supplied to the print execution unit, the second partial print data being partial print data of one page different from the first partial print data and being generated later than the first partial print data, and wherein in a second situation (S22:NO) where it is not confirmed that the specific user is present in the vicinity of the printer when the first partial print data is generated, the supply unit is configured not to supply the first partial print data which is stored in the memory to the print execution unit, and the generation unit is configured to start to generate the second partial print data in the memory. a print execution unit configured to execute a printing operation; and a control device configured to operate as: an original data acquisition unit configured to acquire original data, which is designated as a print target by a specific user and comprises identification information for identifying the specific user; a generation unit configured to sequentially convert each of partial original data of a plurality of pages included in the original data so as to sequentially generate each of partial print data of the plurality of pages in a memory of the printer; a supply unit configured to sequentially supply each of the partial print data of the plurality of pages sequentially generated in the memory to the print execution unit; and a confirmation unit configured to, whenever the partial print data of one page is generated in the memory, confirm whether the specific user is present in the vicinity of the printer by using the identification information, an original data acquisition unit configured to acquire original data, which is designated as a print target by a specific user and comprises identification information for identifying the specific user; a generation unit configured to sequentially convert each of partial original data of a plurality of pages included in the original data so as to sequentially generate each of partial print data of the plurality of pages in a memory of the printer; a supply unit configured to sequentially supply each of the partial print data of the plurality of pages sequentially generated in the memory to the print execution unit; and a confirmation unit configured to, whenever the partial print data of one page is generated in the memory, confirm whether the specific user is present in the vicinity of the printer by using the identification information, wherein in a first situation (S22:YES) where it is confirmed that the specific user is present in the vicinity of the printer when first partial print data, which is the partial print data of one page, is generated in the memory, the supply unit is configured to supply the first partial print data which is stored in the memory to the print execution unit, characterized in that the generation unit is configured to generate second partial print data in the memory after the first partial print data is supplied to the print execution unit, the second partial print data being partial print data of one page different from the first partial print data and being generated later than the first partial print data, and wherein in a second situation (S22:NO) where it is not confirmed that the specific user is present in the vicinity of the printer when the first partial print data is generated, the supply unit is configured not to supply the first partial print data which is stored in the memory to the print execution unit, and the generation unit is configured to start to generate the second partial print data in the memory. the supply unit is configured not to supply the first partial print data which is stored in the memory to the print execution unit, and the generation unit is configured to start to generate the second partial print data in the memory.