The ratios of the number of suicides per day, by day of the week, & on weekdays relative to holidays were calculated using the data for all suicides recorded in Japan in 2003. Among men of all ages, the suicide death ratio on Mondays was found to be significantly high & the ratios were found to decrease over the course of the week. On each weekday, the suicide death ratios among men of productive age were found to be higher than those among men of all ages. Among women, the suicide death ratios on any weekday were found to be higher than 1, but there was no significant difference between the days. Among both men & women, the number of suicides on holidays was lower than that on weekdays. The number of suicides recorded on Mondays is 1.5 times higher than that on holidays among men. (31 refs.)