Set the correct orientation when exporting from Blender to Unity.When exporting models from Blender into Unity one must take into account the handedness of both programs.
Blender considers Z vector as the UP vector, but Unity considers the Y vector as the UP. Now, if you want a model who is facing up in Blender (along Z) to be facing up in Unity (along Y) when imported, follow the video for a fix.

I am a iOS app developer and Unity Game developer.