Lubrication structure for transmission

A lubrication structure for a transmission, comprising:

• a case that contains lubricating oil, the case having a partition wall extending downward from a top surface of the case toward a bottom surface that stores the lubricating oil, the partition wall defining a gear chamber and an adjacent chamber, and the partition wall having an end portion which allows stored lubrication oil to freely flow between the gear chamber and the adjacent chamber;
• the gear chamber having a first internal space that contains the lubricating oil, wherein a pressure in the gear chamber is increased to a prescribed pressure and the gear chamber includes a breather;
• the adjacent chamber having a second internal space communicating to said first internal space through a communicating hole provided in the partition wall at a distance from the end portion, the second internal space attaining a pressure lower than said prescribed pressure;
• and
• an oil catch portion provided in said second internal space at a position directly under said communicating hole, the oil catch portion including a first opening that receives the lubricating oil that flows into said second internal space from said first internal space through said communicating hole and a second opening that allows the lubricating oil to drain from the oil catch portion.