Osaka is one of the most popular tourist destinations in Japan and has numbers of post offices to send and receive deliveries. Here are 4 convenient post offices in the center of Osaka, which are open everyday including weekends and holidays. Moreover, some of them are available 24 hours with night counters.
1.Osaka-Kita Post Office (Close to Osaka Station)
Business Hour: 24 hours
Map: https://goo.gl/maps/K4Hpzizs1V12
2.Naniwa Post Office (Close to Namba Station)
Business Hours: 8:00am-8:00pm Monday to Saturday / 9:00am-6:00pm Sunday
3.Osaka-Minami Post Office (Close to Douton-bori, Shinsaibashi)
Business Hour: 8:00am-9:00pm
Map: https://goo.gl/maps/Ze2JxgM1cpQ2
4.Tennoji MIO Post Office (Close to Tennouji Station)
Business Hour:10:00-18:00 (every day)