In preceding report it was shown that most preservatives when applied on the surface were not effective to prolonging the shelf life. It was further noticed that a group in which the casing was made just after the treatment with preservatives showed rather a shorter storage life than the control group without casing. The present paper deals with the effectiveness of preservatives which were added to the paste before steaming, casing, infrared and/or ultraviolet ray on the keeping quality of "Kamaboko". 1. Ethyl gallate and gallic acid which were added to " Kamaboko" withor without casing were ineffective (See Tables 1 and 2). 2. The casing with cellophane film was effective to prolonging the shelf life as long as three days in contrast to two days in the control group without casing and was effective to the elimination of the secondary contamination (See Table 2). 3. Irradiation by infrared ray all over the surface of the "Kamaboko" without casing was able to prolong the shelf life to four days as contrasted to two days in the control group without irradiation. The combination of the irradiation with preservatives gave no improvement (See Table 3 and Fig. 1a). 4. Daily irradiation by ultraviolet ray all over the surface of the "Kamaboko" without casing was effective to the prolongation of the shelf life to five days as contrasted to two days in the control group without casing. The combination of this irradiation with preservatives gave no improvement (See Table 4 and Fig. 1a). 5. Daily irradiation by ultraviolet ray all over the surface of cellophanecovered "Kamaboko" which contained ethyl gallate at 0.02 or 0.04 % level was effective to prolonging the shelf life as long as seven days in contrast to two days in the control group without casing (See Table 5. and Fig. 1b). 6. Daily irradiation by ultraviolet ray all over the surface of the cellophanecovered "Kamaboko" which contained ethyl gallate and was irradiated with infrared ray just after being prepared was able to prolong the shelf life to seven days in contrast to two days in the control group without casing (See Table 6 and Fig. 1b).