Supporting structure for gear of outboard motor

A supporting structure for a gear of an outboard motor, comprising:

• a first driven gear disposed in front of a driving gear to mesh with the driving gear, the driving gear rotating through transmission of a rotative power from a driving power source;
• a second driven gear disposed at a rear of the driving gear to mesh with the driving gear, the second driven gear having a tubular portion concentrically to a rotational center line, the tubular portion projecting rearward;
• a first conical roller bearing and a second conical roller bearing disposed on an outer periphery of the tubular portion of the second driven gear, the first conical roller bearing and the second conical roller bearing being arranged in a front-rear direction in directions opposite from one another;
• and
• a supporting member disposed on the outer periphery of the tubular portion of the second driven gear, the supporting member being displaceable in an axial direction of the tubular portion, wherein
• the supporting member applies a preload to the first conical roller bearing and the second conical roller bearing and holds the first conical roller bearing and the second conical roller bearing to the outer periphery of the tubular portion of the second driven gear.