A needle bar thread guide for a sewing machine includes a thread guide body mounted on a needle bar and having a threading portion for threading the sewing machine, an introducing portion formed on the thread guide body for introducing a needle thread to the threading portion, and a fall-off preventing member disposed at a position near to spaces over and below the thread guide body. The fall-off preventing member allows the needle thread to be introduced via the introducing portion to the threading portion and prevents the needle thread introduced to the threading portion from falling off from the introducing portion.