To expensively diffuse a harmful insect-avoiding agent to a rice chest by forming the harmful insect-avoiding agent accommodating portion in which a cap body provided with a through hole is engaged with a projection of a rim at the bottom provided on a bottom wall of a weighing apparatus body.

A weighing apparatus body 1 made of polypropylene is formed to a reverse truncated cone shape of which an opening has a slightly bigger diameter than that of a bottom wall and a projection 12 of a rim at the bottom is provided on the bottom wall 11. In a cap body 2 made of polyethylene 2, a circular through hole 22 having a small diameter through which rice grains can not pass is provided on a whole surface of a circular plate 21 and a vertical wall 23 is provided on a whole periphery of the plate 21. An engaging projection 13 having a triangular cross section is circumferentially and continuously provided on an outer wall lower end of the projection 12 of the body 1 and an engaging projection 24 having a triangular cross section is intermittently provided on an inner wall upper end of the vertical wall 23 of the cap body 2. When the vertical wall 23 is engaged with the projection 12, the engaging projection 24 and the engaging projection 13 of the projection 12 are engaged each other to form a harmful insect-avoiding agent accommodating portion 3. At the time of a use, the cap body 2 is once separated from the body 1 and after an aerated bag body accommodating the harmful insect-avoiding agent is inserted into the accommodating portion 3, the cap body 2 is again engaged with the body 1.