Steve Jobs, the ailing tech visionary who founded Apple Inc., said he was unable to continue as chief executive of the technology giant and handed the reins to Chief Operating Officer Tim Cook.

Apple said Mr. Jobs submitted his resignation to the board of directors on Wednesday and "strongly recommended" that the board name Mr. Cook as his successor. Mr. Jobs, 56 years old, has been elected chairman of the board and Mr. Cook will join the board, effective immediately, the company said.

"I...