A lateral protecting mechanism includes a fixing base, a protecting block, a locking component, a driving component and an operating component. The fixing base is fixedly disposed on a lateral portion of a child carrier. The protecting block includes a pivoting shaft and is pivotally disposed on the fixing base by the pivoting shaft. The locking component is slidably disposed inside the fixing base. The driving component is disposed inside the fixing base. The operating component is coupled to the driving component. The operating component drives the driving component to drive the locking component to protrude out of the fixing base to abut against the protecting block for restraining a pivoting movement of the protecting block when the operating component is operated.