An outboard motor (100, 200) configured to be attached to a marine vessel comprising: an engine; a drive shaft (3, 203) configured to transmit a driving force from the engine to a propeller shaft configured to rotate together with a propeller; and a shift shaft configured to switch a shift state of the outboard motor; wherein the shift shaft includes: a first shift shaft and a second shift shaft; and a shift force transmitter configured to transmit, to the second shift shaft, a shift force applied to the first shift shaft, wherein, when the outboard motor (100, 200) is attached to the marine vessel, the shift shaft is disposed forward of the drive shaft (3, 203), the first shift shaft is configured to extend in an upward-downward direction, and the second shift shaft is disposed below the first shift shaft, is spaced apart from and rearward of the first shift shaft, and is configured to extend in the upward-downward direction, and wherein the drive shaft (3, 203) includes: a first drive shaft configured to extend in the upward-downward direction; a second drive shaft disposed below the first drive shaft, the second drive shaft being configured to extend in the upward-downward direction; and a driving force transmitter (33, 233) configured to transmit, to the second drive shaft, a driving force applied to the first drive shaft, characterized in that the second drive shaft is spaced apart from and rearward of the first drive shaft and the shift force transmitter is disposed below the driving force transmitter (33, 233). an engine; a drive shaft (3, 203) configured to transmit a driving force from the engine to a propeller shaft configured to rotate together with a propeller; and a shift shaft configured to switch a shift state of the outboard motor; wherein the shift shaft includes: a first shift shaft and a second shift shaft; and a shift force transmitter configured to transmit, to the second shift shaft, a shift force applied to the first shift shaft, wherein, when the outboard motor (100, 200) is attached to the marine vessel, the shift shaft is disposed forward of the drive shaft (3, 203), the first shift shaft is configured to extend in an upward-downward direction, and the second shift shaft is disposed below the first shift shaft, is spaced apart from and rearward of the first shift shaft, and is configured to extend in the upward-downward direction, and wherein the drive shaft (3, 203) includes: a first drive shaft configured to extend in the upward-downward direction; a second drive shaft disposed below the first drive shaft, the second drive shaft being configured to extend in the upward-downward direction; and a driving force transmitter (33, 233) configured to transmit, to the second drive shaft, a driving force applied to the first drive shaft, characterized in that the second drive shaft is spaced apart from and rearward of the first drive shaft and the shift force transmitter is disposed below the driving force transmitter (33, 233). a first shift shaft and a second shift shaft; and a shift force transmitter configured to transmit, to the second shift shaft, a shift force applied to the first shift shaft, wherein, when the outboard motor (100, 200) is attached to the marine vessel, the shift shaft is disposed forward of the drive shaft (3, 203), the first shift shaft is configured to extend in an upward-downward direction, and the second shift shaft is disposed below the first shift shaft, is spaced apart from and rearward of the first shift shaft, and is configured to extend in the upward-downward direction, and wherein the drive shaft (3, 203) includes: a first drive shaft configured to extend in the upward-downward direction; a second drive shaft disposed below the first drive shaft, the second drive shaft being configured to extend in the upward-downward direction; and a driving force transmitter (33, 233) configured to transmit, to the second drive shaft, a driving force applied to the first drive shaft, characterized in that the second drive shaft is spaced apart from and rearward of the first drive shaft and the shift force transmitter is disposed below the driving force transmitter (33, 233). a first drive shaft configured to extend in the upward-downward direction; a second drive shaft disposed below the first drive shaft, the second drive shaft being configured to extend in the upward-downward direction; and a driving force transmitter (33, 233) configured to transmit, to the second drive shaft, a driving force applied to the first drive shaft, characterized in that the second drive shaft is spaced apart from and rearward of the first drive shaft and the shift force transmitter is disposed below the driving force transmitter (33, 233).