Outboard motor and lubricating oil introducing method thereof

A lubricating oil introducing method of an outboard motor comprising:

• a drive device including a rotatable driving shaft;
• a driveshaft extending in an up-and-down direction below the drive device and configured to rotate according to rotation of the driving shaft;
• a propeller shaft extending horizontally below the driveshaft and configured to rotate according to rotation of the driveshaft;
• a propeller fixed to the propeller shaft;
• a gear device provided between the driveshaft and the propeller shaft and configured to transmit the rotation of the driveshaft to the propeller shaft;
• a driveshaft housing configured to accommodate the driveshaft;
• and
• a gear case bulging laterally below the driveshaft housing and configured to accommodate the gear device,
• wherein an inside of the driveshaft housing communicates with an inside of the gear case,
• an introduction port for introducing lubricating oil into the gear case is opened on the driveshaft housing, and
• a confirmation port for causing the lubricating oil introduced into the gear case to flow out is opened on a front end side of the gear case,
• the lubricating oil introducing method comprising:
• opening the introduction port and the confirmation port;
• introducing the lubricating oil from the introduction port;
• stopping introduction of the lubricating oil from the introduction port after confirming that the lubricating oil flows out from the confirmation port;
• and
• closing the confirmation port.