manufacturing the artificial bait shown in fig1 with reference to fig3 and 4 at first vinyl chloride resin with a plasticizer added thereto is heated as required into a paste like material which is then put into a container 20 and a stirrer 22 is used to stir the interiors of the container 20 so that air bubbles 14 are mixed into the interiors of the container 20 during this operation a dye a pigment and other mixtures may be mixed into the container 20 as required if a core metal 24 is immersed in the paste like unformed material 10a 39 in this state and the core metal 24 is then pulled up then the unformed material 10a 39 having a shape corresponding to the core metal 24 is attached to the peripheral portions of the core metal 24 to thereby form a paste lump 10a and a large number of air bubbles 14 are sealed in the paste lump 10a the paste lump 10a may be solidified to thereby form an artificial bait however in this case the air bubbles attached to the surface of the artificial bait are crushed to provide recessed portions in order not to expose such recessed portions to the surface of the artificial bait there is developed a following manufacturing method also the method of mixing the air bubbles 14 into the unformed material 10a 39 within the container 20 is not limited to the above mentioned method but for example the air bubbles 14 can also be mixed by using such a mechanism as supplies oxygen to a water tank for tropical fishes in other.