TRANSFORMER

The objective of the present invention is to provide an oil-filled transformer having a tank structure that can withstand a rise in the tank internal pressure, while reducing the amount of insulationoil used. This transformer is characterized by comprising a first coil, a second coil adjacent to the first coil, an iron core around which the first coil and the second coil are wound, and a container into which an insulation oil is poured to fill the space around the first coil, the second coil and the iron core, the container having a first surface facing the first coil, a second surface facingthe second coil, and a third surfaces connected to the first surface and to the second surface, the third surface being shaped to protrude into the space between the first surface and the second surface. 本发明的目的在于提供一种油浸式变压器，其油箱结构能够在减少绝缘油使用量的同时承受油箱内的压力上升。变压器的特征在于，包括：第一线圈；与第一线圈相邻的第二线圈；铁心，其中第一线圈和第二线圈卷绕在铁心上；和容器，其中在第一线圈、第二线圈和铁心的周围注入了绝缘油，容器包括与第一线圈相对的第一面、与第二线圈相对的第二面和与第一面和第二面连接的第三面，第三面具有向第一面和第二面之间突出的形状。