The death toll from the earthquake has risen to 34, NHK reports.
Four bodies have been recovered from the shopping mall where part of a floor collapsed in connection with the earthquake, officials in Kumamoto announced.
The earthquake, with a magnitude of 6.8, occurred on Tuesday on the southern island of Kyushu, resulting in several collapsed buildings.
An intensive search for survivors has since been underway. Several people are reported to be injured.
Tuesday's major earthquake was followed by a number of aftershocks that have complicated rescue efforts.
The quake has also caused extensive damage to other buildings and bridges. It has also caused fires, and tens of thousands of residents have been left without power and water.
