The present invention provides a walker including a fastening assembly. The walker has a connection part including two brace units, the fastening assembly assembled with the two brace units, and two side frames mounted to the connection part. The fastening assembly has a first baffle having a pivot end, a second baffle having a clasping portion, a curved wall having at least one plug and connecting the first baffle and the second baffle, and a clasping component pivotally mounted to the pivot end and selectively engaged with the clasping portion. The at least one plug of the fastening assembly is inserted into and fixed by the two brace units and the clasping component is engaged with the clasping portion for further enhancing stability of the connection part and the fastening assembly to prevent the fastening assembly from falling off.
