28 cannot serve sufficiently taking such cases in consideration air holes 51 for discharging the air as shown by an arrow 50 may preferably be provided in the cassette 1 fig6 and 7 show other embodiments of the present invention these figures show the main portion of the hopper 20 in the same manner as fig5 in these embodiments the movable portion is provided only at a portion where the bridging phenomenon of the electronic component chips tends to occur namely at a limited portion in the vicinity of the inlet of the aligning passage in the embodiment shown in fig6 the movable block 29a is shortened in the longitudinal direction compared with the movable block 29 shown in fig5 and it is positioned near the inlet 25 of the aligning passage 24 the guide block 30a has such a shape as to compensate for the shortened size of the movable block 29a other structures are the same as those of the hopper 20 shown in fig5 so that the corresponding elements are denoted by the same reference numerals and the description thereof is not repeated in the embodiment of fig7 the movable block 29b is shortened in the longitudinal direction as in the embodiment of fig6 the movable block 29b is positioned near the inlet 25 of the aligning passage 24 the movable block 29b is positioned to be projected from one wall surface of the small chamber 23 provided by the guide block 30b therefore an inclined surface 53 should preferably be formed on the surface facing the larger chamber 22 of.