The Type 98 50 mm mortar was a Japanese smooth-bore, muzzle-loading weapon of the mid 20th century.

[4] The Type 98 50 mm mortar could be identified by the rectangular, sectionalized base plate, the fixed position of the bipod, the V slots painted white and located at 12 o'clock on both the barrel collar, and the projection of the muzzle hoop and the marking on the outside of the container in which the weapon is packed.

(This marking, which read "Kyuhachi Shiki Totekiki" from right to left, meant "98 Type discharger.

")[2] The propelling charge consisted of black-powder increments packed in small silk bags.

The other end of the stick fitted into a flange on the bottom of a rectangular head made from sheet steel which was fastened with nails or screws.

Two friction igniters would be fitted into holes in the base of the stick bomb and the cords for these fastened to either side of the launcher.