A printing apparatus, comprising: a conveyor configured to convey a sheet along a conveyance path; a driving device configured to drive the conveyor; a printing device configured to print an image on the sheet conveyed by the conveyor; and a controller configured to execute: a printing processing in which the controller controls the driving device and printing device such that the number of printings per unit time is changeable in a state in which the conveyor is driven at a predetermined speed; an indicator change processing in which the controller changes an indicator based on the increase in the number of sheets printed by the printing device; a first processing (S50, S300) in which, when the indicator reaches a preset value, the controller suppresses rise of a temperature in the printing apparatus; and a second processing (S70-S90) in which the controller, when the number of printings performed within a set specific period in the printing processing is equal to or greater than a set reference number, changes the changing manner of the indicator change processing such that an amount of change per sheet is made smaller than in the case where the number of printing performed within the set specific period is smaller than the set reference number, such that frequency of execution of the first processing per unit number of printings is reduced; wherein the reference number is a minimum number of printings in which a time interval between starts of successive conveyances by the conveyor for sheets to be printed successively is less than a length of time that is required for one of the sheets to be conveyed through the conveyance path; and wherein the controller is configured to stop the driving device when a sheet to be printed by the printing device following a certain sheet is not supplied to the conveyance path at a timing when the certain sheet is discharged from the conveyance path. a conveyor configured to convey a sheet along a conveyance path; a driving device configured to drive the conveyor; a printing device configured to print an image on the sheet conveyed by the conveyor; and a controller configured to execute: a printing processing in which the controller controls the driving device and printing device such that the number of printings per unit time is changeable in a state in which the conveyor is driven at a predetermined speed; an indicator change processing in which the controller changes an indicator based on the increase in the number of sheets printed by the printing device; a first processing (S50, S300) in which, when the indicator reaches a preset value, the controller suppresses rise of a temperature in the printing apparatus; and a second processing (S70-S90) in which the controller, when the number of printings performed within a set specific period in the printing processing is equal to or greater than a set reference number, changes the changing manner of the indicator change processing such that an amount of change per sheet is made smaller than in the case where the number of printing performed within the set specific period is smaller than the set reference number, such that frequency of execution of the first processing per unit number of printings is reduced; a first processing (S50, S300) in which, when the indicator reaches a preset value, the controller suppresses rise of a temperature in the printing apparatus; and a second processing (S70-S90) in which the controller, when the number of printings performed within a set specific period in the printing processing is equal to or greater than a set reference number, changes the changing manner of the indicator change processing such that an amount of change per sheet is made smaller than in the case where the number of printing performed within the set specific period is smaller than the set reference number, such that frequency of execution of the first processing per unit number of printings is reduced; wherein the reference number is a minimum number of printings in which a time interval between starts of successive conveyances by the conveyor for sheets to be printed successively is less than a length of time that is required for one of the sheets to be conveyed through the conveyance path; and wherein the controller is configured to stop the driving device when a sheet to be printed by the printing device following a certain sheet is not supplied to the conveyance path at a timing when the certain sheet is discharged from the conveyance path.