Horinouchi

Weekday departures: 489/day

First / last departure (weekday): 4:57 / 24:37 (00:37 next day)

Busiest hour: 7:00–8:00 (31)

0:00 ─ 23:00

Figures are typical departures in the timetable data, not a live service count.

Timetable data as of 5 May 2026.

Weekday figures cover every line at this station. For Saturdays and holidays the timetable data is incomplete for some or all lines, so those figures are departures in the available timetable data, not totals.

Lines where the timetable data is incomplete:

• Keikyu Kurihama Line: no Saturday, Sunday or holiday timetable
• Keikyu Main Line: no Saturday, Sunday or holiday timetable

• Keikyu Kurihama Line: Shin-otsu
• Keikyu Main Line: Kenritsudaigaku ⇄ Keikyu Otsu

Horinouchi Station opened on 1 April 1930 as Yokosuka-Horinouchi Provisional Station on the Shōnan Electric Railway, sited some 180 m closer to Yokosuka-Chūō than the current location. In June 1936 it was upgraded to a full station. On 1 November 1941 the Shōnan Electric Railway and Keihin Electric Railway merged; on 1 May 1942 the merged operator was absorbed into the Tokyo Yokohama Electric Railway (the wartime "Great Tokyu"). On 1 December 1942 the Kurihama Line opened as far as Kurihama Provisional Station (now Keikyū-Kurihama), and the station was relocated to its present site. With the dissolution of the wartime Tokyu, Keihin Kyūkō Electric Railway was established on 1 June 1948. The station took its present name on 1 September 1961. Service was upgraded from a limited-express to a rapid-limited-express stop on 31 July 1999; the arrival melody "Kamome ga Tonda Hi" ("The Day the Seagull Flew") was introduced on 21 November 2008; a new station building was built in 2017. Station number KK61 was assigned on 21 October 2010.

Horinouchi is a ground-level station with two island platforms serving four tracks; because it stands on sloping ground, the ticket gates sit below the platforms. The Main Line and the Kurihama Line diverge at a flat crossing on the Uraga side. Despite being the Kurihama Line's origin, the station has no holding sidings, and most Kurihama Line trains run through onto the Main Line towards Yokohama and Shinagawa; a single crossover at the Shinagawa end lets originating and terminating trains, mainly in the early morning and at night, as well as empty workings to and from the depot, reverse on the up Main Line. Of the four tracks, track 1 is for Uraga-bound trains only, track 2 for Keikyū-Kurihama-bound trains (and some Uraga-bound ones), track 3 for up trains from the Uraga direction and track 4 for up trains from the Keikyū-Kurihama direction. Only track 2 is connected to both the Main Line and the Kurihama Line, so express-to-local connections are possible between down Main Line trains but not on the Kurihama Line or between up Main Line trains. The approach melody, arranged by Hiroshi Shiozuka, is based on "Kamome ga Tonda Hi" ("The Day the Seagull Flew"), the signature song of Machiko Watanabe, who comes from Miharu-chō in Yokosuka: the down platform uses the B-melody and the up platform the chorus. The Kanazawa-Bunko permanent way district's track gang and other engineering-department offices are based in the station precincts.