The invention provides a robot simulator which has nothing to do with degree of proficiency of an operator and allows the operator to easily operate intuitively, a robot teaching apparatus and a robot teaching method. The robot simulator includes a generating unit, a display unit, a display control unit, and a simulation instructing unit. The generating unit generates a virtual image that includes a virtual robot obtained by imaging an actual robot having at least one axis and an operation handle capable of operating three-dimensional coordinate axes having a predetermined control point of the virtual robot as the origin. The display control unit displays on the display unit the generated virtual image. The simulation instructing unit, when an operator's operation for the operation handle is received, acquires at least one of a displacement amount of the control point and a rotation amount of the three-dimensional coordinate axes attributable to the operator's operation, and instructs the generating unit to regenerate the virtual image in which a posture of the virtual robot is changed in accordance with the displacement amount or the rotation amount thus acquired.