Police on Monday have found the bodies of a 40-year-old woman and her two-month-old baby on the coastline of Akaho, Hyogo Prefecture, which faces the Seto Inland Sea.
The pair had gone missing on Saturday. The body of the woman was found at a campsite and the boy's was floating in the sea nearby.
The police plan to conduct autopsies to determine of the cause of the deaths.
During the search for the pair, who disappeared after going to the camping area, which lies about 3 km southeast of Banshu-Ako Station, a note was found in the woman's vehicle at the campsite's parking lot, the police said.
A passerby noticed a 4-year-old boy, who was the woman's eldest son, crying at the parking lot at around 6:10 p.m. on Saturday and reported the incident to the police.