Provided are: a clip having good bworkability and with which it is possible to suppress or prevent
detachment of a ceiling surface material when a building vibrates; a ceiling base using the clip; and
a method for installing the ceiling base. A clip 50 for securing a  joist  40 to a  joist  bearing 30, the clip 50 having: a top piece 53 that has the width of the  joist  piece 5l that hangs from one end ofthe top piece 53 and comprises therebelow a first engagement projection 54 that engages
with the  joist  40; and a second hanging piece 52 that hangs from the other end of the top
piece 53 and comprises therebelow a second engagement projection 57 that is locked to
thejoist 40, the first hanging piece 5l having a greater length than the second bearing 30; a first
hanging hanging piece 52, a recessed section 58 that projects
in the direction of the second hanging piece 52 being provided in the midway position of
the first hanging piece 51, only the first engagement projection 54 comprising an engagement cavity 55 that is concave downward at the projecting base of the first engagement projection
54, and a reinforcement rib 56 being provided on the outer side of at least the engagement cavity
55.

Provided are: a clip having good workability and with which it is possible to suppress or prevent detachment of a ceiling surface material when a building vibrates; a ceiling base using the clip; and a method for installing the ceiling base. A clip 50 for securing a joist 40 to a joist bearing 30, the clip 50 having: a top piece 53 that has the width of the joist bearing 30; a first hanging piece 51 that hangs from one end of the top piece 53 and comprises therebelow a first engagement projection 54 that engages with the joist 40; and a second hanging piece 52 that hangs from the other end of the top piece 53 and comprises therebelow a second engagement projection 57 that is locked to the joist 40, the first hanging piece 51 having a greater length than the second hanging piece 52, a recessed section 58 that projects in the direction of the second hanging piece 52 being provided in the midway position of the first hanging piece 51, only the first engagement projection 54 comprising an engagement cavity 55 that is concave downward at the projecting base of the first engagement projection 54, and a reinforcement rib 56 being provided on the outer side of at least the engagement cavity 55.