PURPOSE: To feed a storage tank with grains in a relatively uniform manner, by installing two types of high and low grain concave parts in an inner surface of the bucket attached to a belt of a bucket type elevator.

CONSTITUTION: In both upper and lower parts of an elevator case 14, there are provided with an upper rolling wheel 15 and a lower rolling wheel 16, and a belt 18, to which buckets 17 and 17 are attached, is rolled on these upper and lower rolling wheels 15 and 16. Each of these buckets 17 and 17 is constituted of such one having a high grain concave part 19, where a part in which grains enter is situated in a higher position than the belt 18 and such one having low grain concave part, where a part in which grains enter is situated in a lower position than the belt 18, and each of them are alternately attached thereto. When the bucket 17 having the high grain concave part 19 rotates along the upper rolling wheel 15, this turning force blows off grains so remote a distance away inside a storage tank 2, and in case of another bucket having the low grain concave part 20, it blows off the grains nearby in the tank the other way so that the grains are spreadble wide in a relatively uniform manner.