it is not yet known but there are theory's.
One is that he dug up Obito and got the sharingan from him. no one from Konoha would do this so he could have gotten the transplant from orochimaru. but i think that is unlikely because orochimaru wanted the sharingan himself. This may not be true because Obitos body was completely crushed.
Another theory is that orochimaru made a sharingan and gave it to danzo for testing purposes. But this is too far-fetched to believe.
Another is that Danzo is Obito which would would explain why one of his sides is wrapped and he got a normal eye from somewhere else (Obito gave one of his eyes to kakashi.) but Obito would be too young because danzo held a grudge against the 3rd hokage.
My theory is that Danzo has a connection with "tobi" or madara. tobi only shows one of his eyes through his mask so it is possible that madara gave his other eye to danzo in an agreement. I don't think that this is the case though.
We will just have to wait and see.
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But, I know It clearly say in the manga 459 that it is Uchiha Shisui's who is the guy that Itachi killed to get the last form of the sharingan. Took a wrong answer to find the right one.
danzo gets his sharingan from shisui, who was itachi's best friend, before itachi killed him in order to activate his own mangyekou sharingan. When shisui was killed, dnazo took his eye from his dead body.
Seemingly, Danzo took the Sharingan from Shisui Uchiha. Whether it was before or after Itachi Uchiha killed him, it is unknown. He has ten sharingan implanted in his right arm, these were taken from the deceased after the Uchiha massacre.
Danzo has 10 sharingans implanted into his arm, presumably normal ones, and Shisui Uchiha's Mangekyou Sharingan in his right eye socket. However, he controls the ANBU Black Ops and has a wide range of informants. He was very powerful, but has injuries to his right arm and eye. He is seeking Kabuto, who would have acess to Orochimaru's powerful jutsu and medicines.
No, Obito still has his right eye. Danzo's sharingan was taken from Shisui Uchiha.
After he ordered the massacre, he took the Sharingan eyes from the bodies of the deceased, along with taking Shisui's eye after it was stolen after his death.
Danzo does have the Sharingan, Manga 455, he has one in his eye socket and ten implanted in his right arm.
He Got it From Obito when he was on a mission when he was younger. Obito got crushed by a rock and gave kakashi his Sharingan as a gift before he died. Obito had the Sharingan because he was an Uchiha.
Danzo only has 1 sharingan eye on his right side also he has some kind of special arm (his right arm also) his sharingan first shows on naruto shippuden episode 199 but it only shows for a few sec when he kills these assassins with his eye.
He wasn't born with Sharingans. He collect Sharingans from the Uchiha Massacre and by the help of Orochimaru he implanted Sharingans in his hand and one eye along with First hokage cell for chakra.
behind Danzo's mask is what Danzo absorbed out of Uchiha Shisui.
When Danzo held Karin hostage, Sasuke used this opportunity and sacrificed Karin by stabbing her with his "Chidori Spear" to get Danzo through the heart. Within his last few minutes of his life, Danzo used his final Jutsu called "Reverse Four Symbol Sealing" in hopes of sealing Madara and Sasuke along with him in his death, but it failed since Sasuke and Madara got away from it in time and Danzo ended up in suicide.