Héctor's Guitar (previously known as Ernesto's Guitar) is a guitar owned by Héctor from the 2017Pixar film, Coco. It was used by Miguel who was transported to the Land of the Dead. The top of the guitar looks similar to a skull, with a gold tooth like its original owner.
In earlier drafts of the film, Héctor's guitar was originally carried over in the Land of the Dead with Miguel (who was named Marco) when he was cursed. It had to be protected by Miguel as it was his ticket to go back to the Land of the Living. It was destroyed by Ernesto de la Cruz in the original climax but was repaired by the Riveras after Ernesto was reviled by the dead in his Sunrise Spectecular. This was altered as getting a family blessing made more sense so the guitar remained intact in the final cut.
This guitar was a gift given to Héctor by Imelda and went on to become Héctor's instrument during his tour across Mexico. However, his former partner Ernesto de la Cruz stole it along with Héctor's songbook after poisoning and killing him. This guitar would be continuously used until Ernesto's death during his performance of "Remember Me" in 1942. Ernesto had placed the guitar aside mere moments before he was crushed by a heavy bell, so it survived intact. The guitar was then stored in Ernesto's mausoleum in Santa Cecilia's cemetery.
Much later in the present day, an angry Miguel Rivera breaks into Ernesto's mausoleum on the night of Día de los Muertos and strums his guitar which causes him to be transported to the Land of the Dead. After Mama Imelda gives him the blessing, he is transported back to the Land of the Living but tries to take the guitar which broke the condition of the blessing - never to play music again - thus transporting him back to the Land of the Dead.
Following the film's climax, Miguel runs back home with Héctor's guitar the next morning after being transported back to the Land of the Living after being given a blessing by both Imelda and an almost forgotten Héctor. He uses it to play "Remember Me" which rejuvenates Mamá Coco's memories of Héctor, thus saving her father from his 'final death'. Since then, the guitar was placed on display with Héctor's framed letters to Coco at the Rivera residence as Santa Cecilia's new attraction, following the reveal of Ernesto's crimes. On the following Día de Los Muertos, it is used by Miguel to celebrate the holiday. Héctor plays a spiritual version of his guitar in a guitar duet with Miguel.
Héctor's Guitar appears in Cars 3 as a decoration in Thomasville's Cotton Pin Bar & Grill.
Miguel had made a replica of the guitar, in which he plays while watching one of the Ernesto's films before it was destroyed by his grandmother.
The large guitar-shaped swimming pool in Ernesto's mansion deeply resembles the guitar that he took from Héctor.
In a few of the deleted scenes, the guitar was with Miguel during his time in the Land of the Dead.