To provide a fixed-amount dispenser included in a box container or a bottle container which can dispense an approximately fixed amount of powder and granular substance only by tilting the container.

In a fixed-amount dispenser including a dispense path and a weighing chamber, the dispense path has a wall member 1, an inner partition 2 in contact with a hood 3 at a predetermined distance L from the wall member 1, and a bottom plate 7, while the wall member 1 or the hood 3 includes a powder and granular substance dispense port 9 and the inner partition 2 includes a powder outlet port 9 from the weighing chamber. The weighing chamber has an outer partition 4 at a predetermined distance L' larger than the distance L from the wall member and the bottom plate 7, while a powder and granular substance inlet port 10 is included between the inner partition 3 and the outer partition 4 or on a part of the outer partition 4.