A developer replenishing cartridge, comprising: a developer replenishing container, and a developer, the developer replenishing cartridge being removably mountable to a developer replenishing apparatus; wherein: the developer replenishing container includes (i) a developer containing portion for containing the developer, (ii) a discharge port for discharging the developer contained in the developer containing portion, and (iii) a pump portion that operates so that a state where an internal pressure of the developer containing portion is lower than an atmospheric pressure and a state where the internal pressure is higher than the atmospheric pressure alternately repeatedly switch with each other; the developer contains toner; the toner includes toner particles each containing a binder resin and a wax, and silica fine particles present on surfaces of the toner particles; the silica fine particles have a number-average particle diameter of primary particles of 60 nm or more and 300 nm or less; a coverage rate of the surfaces of the toner particles with the silica fine particles is 15% or more and 95% or less; a sticking ratio of the silica fine particles is 80 mass% or more with reference to a total amount of the silica fine particles; the toner has a uniaxial collapse stress at a maximum consolidation stress of 10.0 kPa, of 2.5 kPa or more and 3.5 kPa or less; and the developer is contained in the developer containing portion of the developer replenishing container. a developer replenishing container, and a developer, the developer replenishing cartridge being removably mountable to a developer replenishing apparatus; wherein: the developer replenishing container includes (i) a developer containing portion for containing the developer, (ii) a discharge port for discharging the developer contained in the developer containing portion, and (iii) a pump portion that operates so that a state where an internal pressure of the developer containing portion is lower than an atmospheric pressure and a state where the internal pressure is higher than the atmospheric pressure alternately repeatedly switch with each other; the developer contains toner; the toner includes toner particles each containing a binder resin and a wax, and silica fine particles present on surfaces of the toner particles; the silica fine particles have a number-average particle diameter of primary particles of 60 nm or more and 300 nm or less; a coverage rate of the surfaces of the toner particles with the silica fine particles is 15% or more and 95% or less; a sticking ratio of the silica fine particles is 80 mass% or more with reference to a total amount of the silica fine particles; the toner has a uniaxial collapse stress at a maximum consolidation stress of 10.0 kPa, of 2.5 kPa or more and 3.5 kPa or less; and the developer is contained in the developer containing portion of the developer replenishing container. the developer replenishing container includes (i) a developer containing portion for containing the developer, (ii) a discharge port for discharging the developer contained in the developer containing portion, and (iii) a pump portion that operates so that a state where an internal pressure of the developer containing portion is lower than an atmospheric pressure and a state where the internal pressure is higher than the atmospheric pressure alternately repeatedly switch with each other; (i) a developer containing portion for containing the developer, (ii) a discharge port for discharging the developer contained in the developer containing portion, and (iii) a pump portion that operates so that a state where an internal pressure of the developer containing portion is lower than an atmospheric pressure and a state where the internal pressure is higher than the atmospheric pressure alternately repeatedly switch with each other; the developer contains toner; the toner includes toner particles each containing a binder resin and a wax, and silica fine particles present on surfaces of the toner particles; the silica fine particles have a number-average particle diameter of primary particles of 60 nm or more and 300 nm or less; a coverage rate of the surfaces of the toner particles with the silica fine particles is 15% or more and 95% or less; a sticking ratio of the silica fine particles is 80 mass% or more with reference to a total amount of the silica fine particles; the toner has a uniaxial collapse stress at a maximum consolidation stress of 10.0 kPa, of 2.5 kPa or more and 3.5 kPa or less; and the developer is contained in the developer containing portion of the developer replenishing container.